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Supply side economics and demand side economics

已有 1400 次阅读2015-11-28 09:00 |个人分类:经济



     Demand side economics is an outgrowth from Keynesian economics, which is contrary to accepted economic theories, a government ought to cut taxes and increase infrastructure spending with fiscal deficit during an economic downturn, and focus on increasing tax revenue during an economic upturn, which may result in an increase in the nominal wages of those who tend to spend the greatest portion of their income on consumables, which results in improved business income and grows the economy.

     Supply-side economics argues that economic growth can be most effectively created by investing in capital, and by lowering barriers on the production of goods and services, consumers will then benefit from a greater supply of goods and services at lower prices; furthermore, the investment and expansion of businesses will increase the demand for employees and therefore create jobs. Typical policy recommendations of supply-side economists are lower marginal tax rates and less government regulation.

   As my view, that Demand side economics is mainly investment in infrastructure and that Supply-side economics is mainly to create a good living environment for businesses’ operation.

  In comparison, though that investment in infrastructure may harmful for the long term economic development, but it really may play a quick role in stimulating economy. And that creates a good living environment for businesses’ operation will be conducive to long term economic development, however, it is a hard systematic process that needs a longer time and comprehensive social reform to achieve its positive role.

 In view of that the two big economies – the United States and China is both reviewing its economic development policies, which may lead economy from current Demand side economics turning to Supply-side economics. Especially, that China may put it into practice soon. We can speculate that the world economy will continue towards recession for a while.


Demand side economics


Demand side economics is an outgrowth from Keynesian economics, which is of course itself the economic theories espoused by John Maynard Keynes. Keynesian economics proposed a series of economic ideas that ran contrary to the classic economic formulations, notably the concept of counter-cyclical budget management as a means to mitigate the ebb and flow of economic cycles of glut and recession. For Keynes, aggregate demand from businesses, the government andconsumers is a more important influencing economic activity than free market forces. Keynesian economics disagrees with the classical economics of Adam Smith and others by maintaining that unfettered free markets do not inevitably lead to full employment.

To accomplish this, Keynes proposed that, contrary to accepted economic theories, a government ought to cut taxes and increase infrastructure spending during an economic downturn, and focus on increasing tax revenue during an economic upturn.

Demand side economics comes into play when the increases in infrastructure spending and cuts in taxes results in an increase in the nominal wages of those who tend to spend the greatest portion of their income on consumables. Keynes viewed excessive saving and investment as a potential harm to the economy, since giving additional income to the rich gives them a low marginal incentive to spend, whereas giving additional income to the poor and middle class provides a high marginal incentive for additional spending -- which results in improved business income and grows the economy.

Since Keynes, worldwide governments have felt they have a duty to maintain employment at a high level.[1]


Supply-Side Economics

Supply-side economics is better known to some as "Reaganomics," or the "trickle-down" policy espoused by 40th U.S. President Ronald Reagan. He popularized the controversial idea that greater tax cuts for investors and entrepreneurs provide incentives to save and invest, and produce economic benefits that trickle down into the overall economy. In this article, we summarize the basic theory behind supply-side economics.

Like most economic theories, supply-side economics tries to explain both macroeconomic phenomena and - based on these explanations - offer policy prescriptions for stable economic growth. In general, supply-side theory has three pillars: tax policy, regulatory policy and monetary policy.

However, the single idea behind all three pillars is that production (i.e. the "supply" of goods and services) is most important in determining economic growth. The supply-side theory is typically held in stark contrast to Keynesian theory which, among other facets, includes the idea that demand can falter, so if lagging consumer demand drags the economy into recession, the government should intervene with fiscal and monetary stimuli.

This is the single big distinction: a pure Keynesian believes that consumers and their demand for goods and services are key economic drivers, while a supply-sider believes that producers and their willingness to create goods and services set the pace of economic growth.

The Argument That Supply Creates Its Own Demand
In economics we review the supply and demand curves. The left-hand chart below illustrates a simplified macroeconomic equilibrium: aggregate demand and aggregate supply intersect to determine overall output and price levels. (In this example, output may be gross domestic product and the price level may be the Consumer Price Index.) The right-hand chart illustrates the supply-side premise: an increase in supply (i.e. production of goods and services) will increase output and lower prices.

Starting PointIncrease in Supply
(Production)
CT-SpplySideEcon1.GIFCT-SpplySideEcon2.GIF

Supply-side actually goes further and claims that demand is largely irrelevant. It says that over-production and under-production are not sustainable phenomena. Supply-siders argue that when companies temporarily "over-produce," excess inventory will be created, prices will subsequently fall and consumers will increase their purchases to offset the excess supply.

This essentially amounts to the belief in a vertical (or almost vertical) supply curve, as shown in the left-hand chart below. In the right-hand chart, we illustrate the impact of an increase in demand: prices rise but output doesn't change much.

Vertical Supply CurveAn Increase in Demand
→ Prices Go Up

CT-SpplySideEcon3.GIFCT-SpplySideEcon4.GIF

Under such a dynamic - where the supply is vertical - the only thing that increases output (and therefore economic growth) is increased production in the supply of goods and services as illustrated below:

Supply-Side Theory

Only an Increase in Supply (Production) Raises Output
CT-SpplySideEcon5.GIF

Three Pillars
The three supply-side pillars follow from this premise. On the question of tax policy, supply-siders argue for lower marginal tax rates. In regard to a lower marginal income tax, supply-siders believe that lower rates will induce workers to prefer work over leisure (at the margin). In regard to lower capital-gains tax rates, they believe that lower rates induce investors to deploy capital productively. At certain rates, a supply-sider would even argue that the government would not lose total tax revenue because lower rates would be more than offset by a higher tax revenue base - due to greater employment and productivity.

On the question of regulatory policy, supply-siders tend to ally with traditional political conservatives - those who would prefer a smaller government and less intervention in the free market. This is logical because supply-siders - although they may acknowledge that government can temporarily help by making purchases - do not think this induced demand can either rescue a recession or have a sustainable impact on growth.

The third pillar, monetary policy, is especially controversial. By monetary policy, we are referring to the Federal Reserve's ability to increase or decrease the quantity of dollars in circulation (i.e. where more dollars mean more purchases by consumers, thus creating liquidity). A Keynesian tends to think that monetary policy is an important tool for tweaking the economy and dealing with business cycles, whereas a supply-sider does not think that monetary policy can create economic value.

While both agree that the government has a printing press, the Keynesian believes this printing press can help solve economic problems. But the supply-sider thinks that the government (or the Fed) is likely to create only problems with its printing press by either (a) creating too much inflationary liquidity with expansionary monetary policy, or (b) not sufficiently "greasing the wheels" of commerce with enough liquidity due to a tight monetary policy. A strict supply-sider is therefore concerned that the Fed may inadvertently stifle growth.

What's Gold Got to Do with It?
Since supply-siders view monetary policy not as a tool that can create economic value, but rather a variable to be controlled, they advocate a stable monetary policy or a policy of gentle inflation tied to economic growth - for example, 3-4% growth in the money supply per year. This principle is the key to understanding why supply-siders often advocate a return to thegold standard, which may seem strange at first glance (and most economists probably do view this aspect as dubious). The idea is not that gold is particularly special, but rather that gold is the most obvious candidate as a stable "store of value." Supply-siders argue that if the U.S. were to peg the dollar to gold, the currency would be more stable, and fewer disruptive outcomes would result from currency fluctuations.

As an investment theme, supply-side theorists say that the price of gold - since it is a relatively stable store of value - provides investors with a "leading indicator" or signal for the dollar's direction. Indeed, gold is typically viewed as an inflation hedge. And, although the historical record is hardly perfect, gold has often given early signals about the dollar. In the chart below, we compare the annual inflation rate in the United States (the year-to-year increase in the Consumer Price Index) with the high-low-average price of gold. An interesting example is 1997-98, when gold started to descend ahead of deflationary pressures (lower CPI growth) in 1998.

CT-SpplySideEcon6.gif

The Bottom Line
Supply-side economics has a colorful history. Some economists view supply-side as a useful theory. Other economists so utterly disagree with the theory that they dismiss it as offering nothing particularly new or controversial as an updated view of classical economics. Based on the three pillars discussed above, you can see how the supply side cannot be separated from the political realms since it implies a reduced role for government and a less-progressive tax policy.

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Demand-Side Policy Gave Us the Big Economic Fizzle

The unstimulating stimulus ignored basic principles of economic incentives.

http://www.wsj.com/articles/SB10001424052702304418404579467141423574578

Nearly five years since the recession ended in June 2009, economic policy discussions continue to focus on dubious short-term countercyclical measures to "stimulate demand." The Economic Report of the President for 2014 wastes an entire chapter rehashing the jobs supposedly "saved or created" by the 2009 fiscal stimulus and Federal Reserve easing. That analysis relies on notoriously inaccurate forecasting models to take credit for the entirely prosaic facts that (1) the last recession eventually ended just as all previous recessions did, and that (2) employment subsequently rose a bit.

This evades the key issue: Did fiscal or monetary stimulus actually "stimulate demand"?

In recent years the U.S. has experimented with demand-side stimulants on an unprecedented scale. Monetary stimulus involves pushing interest rates down to subsidize big borrowers (mainly governments and banks) at the expense of small savers (seniors). That was the reason the Fed shoved the federal-funds rate down to near zero. Even quadrupling the Fed's assets had no clear and significant impact on the sluggish growth of nominal GDP.

Fiscal stimulus involves big increases in the national debt, in the hope that taxpayers will not notice that national debt is their debt. Borrowing from Peter to pay Paul is thought to provide a net increase in their combined income or wealth, and therefore faster growth in total spending or "aggregate demand."

To find out if fiscal stimulus worked as advertised, we first need to separate deliberate increases in budget deficits from the portion caused by lost incomes and jobs. Once that separation is taken into account, we see that—according to Congressional Budget Office estimates of cyclically-adjusted budget deficits—the average increases were an unprecedented 5.7% of potential GDP from 2009 to 2012. No fiscal stimulus that large ever happened before in peacetime, and certainly not for four full years.

What happened? After such energetic demand-side stimulus, nominal GDP rose by only 3.8% a year from 2010 to 2013, and by 4% in the first quarter of 2014, compared with average GDP growth of 6.1% from 1983 to 2007. Ironically, the Economic Report of the President predicts faster growth of demand from now on—5% or more—but only after deep cuts in federal spending and euthanasia of quantitative easing. The promised stimulus from the previous fiscal and monetary binge remains undetectable—a big fizzle. Demand grew much faster (at a 6.1% pace) from 1998 to 2000, when the budget was in surplus and the Fed hiked the fed-funds rate to 6.5%.

With either monetary or fiscal stimulus, the intended boost in today's spending comes from borrowing against tomorrow's income. That impulse to shift purchases forward accounts for such ephemeral deficit-increasing schemes as the home-buyer tax credit, the cash-for-clunkers tax credit, the refundable "making work pay" tax credit and temporary payroll tax cuts. As Europe is learning, however, borrowing from the future is no fun when the future arrives.

What was thought to be a short-term stimulus to demand may end up being a long-term drag on supply. Expectations of even higher taxes on additions to future income likely discouraged investments that would have increased future income. There is an expense, and a risk, involved in expanding a small business or improving your education, and the incentive to do either is dampened if the resulting higher income—if any—shoves you into higher tax brackets that federal and state politicians seem so eager to increase again and again. Business investments that pay off only in the long term are particularly sensitive to the prospect of higher tax rates on profits.

Federal Reserve efforts to keep interest rates absurdly low have reduced the incentive to earn and save money for the future while encouraging risky debt and dodgy investments. Flattening the yield curve through Fed purchases of long bonds made it less profitable for banks to lend to small business.

The fact that employment has gradually risen from 140 million to 145.7 million since the recession ended is unremarkable. What is truly remarkable is that at the same time that job opportunities improved, the number of Americans who were neither working nor seeking work soared from 80.9 million to 91.4 million.

One economist who understands the importance of work disincentives is University of Chicago economist Casey Mulligan, author of "The Redistribution Recession" (2012), who first blew the whistle on punitive work disincentives in ObamaCare. Another is Nobel Laureate Ed Prescott, who demonstrated on this page ("Why Do Americans Work More Than Europeans?" Oct. 21, 2004) that the people of France are a third poorer than Americans only because they were deprived of incentives to work—by onerous marginal tax rates on excess effort and generous subsidies to indolence.

The demand-side panacea for weak economic growth has encouraged families and firms to spend a larger fraction of their current income and wealth—by using tax and monetary policy to punish savers and reward debtors. A supply-side solution would incentivize families and firms to produce more income and wealth by minimizing unpredictable regulation and litigation, trade barriers, unreliable money and dispiriting tax rates.

Demand-side economists focus on incentives to borrow and spend. Supply-side economists focus on incentives to work, save, invest and launch new businesses. Demand-side economists focus on the uses of income and debt (consumption). Supply-side economists focus on sources of income and wealth.

From the perspective of demand-side bookkeeping, the fact that consumer spending in 2012 accounted for 68.6% of GDP supposedly means economic growth depends on consumer sentiment. Viewed from the supply side—the sources of GDP—private industry accounted for 86.5% of GDP. If private businesses had not produced $14.1 trillion, consumers could not possibly have consumed $11.1 trillion. Economies do not grow because consumers spend more; consumers can spend more only if economies grow.

The time for demand-side gimmicks has long passed. The remarkably aggressive fiscal and monetary effort to stimulate demand did not stimulate demand. Even if it had worked, we can't pretend to be "fighting recession" forever. Today's economic predicament is not a cyclical crisis but a sustained, subsidized lethargy. Different tasks require different tools. When the number of job seekers falls twice as fast as the increased number of jobs, that is a supply-side problem.

Mr. Reynolds is a senior fellow with the Cato Institute.

How the Demand-Siders Ruined the U.S. Economy


I cover the intersection of economics and politics.



The latest, grim data confirm that the post-recession U.S. economic recovery of 2009-2011 has been one of the weakest on record. Real GDP growth since the recession that ended in mid-2009 has been a meager 5%, compared to average growth of 9% at this same point following nine previous recessions since WWII.

In these prior recoveries private sector employment had grown by an average of 5.7%, but this time it’s up by only 0.9%, and while past recoveries saw the jobless rate decline by an average of 1.5% points, this time it has declined by only a third as much. Perhaps worse still, whereas in prior U.S. recoveries the duration of joblessness rose by an average of 1.5 weeks, this time it’s up by 15.5 weeks – to an all-time high of 39 weeks.

Many apologists for the Obama Administration and the Bernanke Fed claim that the recent recovery has been weak because the prior downturn was so steep. “The ditch was deeper than we first thought,” Obama himself likes to say, and that’s why it’s taking longer to climb out. But history reveals the opposite pattern: Robust recoveries tend to follow the deepest recessions, while weak recoveries follow shallow recessions.

The undeniable anemia of the current U.S. recovery, coming as it does on the heels of what’s now called “the great recession” of 2007-2009, implies that Obama-Bernanke have done all the wrong things – not “too little” of the right things. Yet many economists insist on still more deficit-spending and/or money-printing.

Now consider that this pathetic recovery was “achieved” by a ridiculous increase of 54% in the U.S. public debt (from $9.3 trillion as the recession began in late-2007, to $14.3 trillion today) and of 211% in the Fed’s monetary base (from $825 billion to $2.5 trillion), which serves as latent rocket fuel for rising inflation rates.  These numbers would be horrific enough were they merely the inadvertent fallout of otherwise reasonable and well-meaning public policies; but in truth the results are the inevitable result of two highly-acclaimed, widely applauded but deadly policy approaches: Keynesianism and Monetarism.

Both schools, while posing as academic rivals, in fact have far more in common than they admit. Both obsess about mere spending and consumption — the economy’s “demand-side” — to the neglect and harm of its all-important supply-side. What always drives a robust economy is not “consumers” per se but savers, investors, innovators and producers.

Whereas Keynesians claim a free economy is at risk of “over-producing” and under-consuming, Monetarists claim it is at risk of “deflation” due to insufficient money supplies. The Keynesians are always eager to boost what they call “insufficient aggregate demand,” typically by means of government deficit-spending, a policy they tout as “stimulus.”

Likewise, the Monetarists are ever-eager to counter imagined threats to demand allegedly posed by insufficient money-creation, and if necessary they’d resort to helicopters to dispense the needed money from above, a policy they call “quantitative easing.” Yet these demand-side schemes – Keynesian deficit-spending and Monetarist money-printing alike — only erode entrepreneurial and productive prowess. For example, today’s dangerously long duration of unemployment (39 weeks) reflects repeated extensions of jobless benefits, which Keynesians demand as a way to stoke more consumption, not extra jobs or output.

In truth, and contra-Keynesianism, mere consumption is the effect of production, not its cause; to consume is equivalent to using up or destroying wealth, not creating it anew. Likewise, and contra-Monetarism, the mere creation of fiat paper money (or bank reserves) by a monopoly central bank isn’t the same as creating real wealth; indeed, more often than not the effect — inflation — only undermines the wealth-production process, by distorting price signals, while simultaneously robbing unsuspecting money-holders of purchasing power.

Sadly, U.S. policymakers seem to be aping the crazy policies adopted by their Japanese counterparts starting two decades ago: gargantuan deficit-spending and money-printing. Keynesian and Monetarist policies can easily cross borders, much like viruses. Japan’s economy has stagnated during this time, not “in spite of” its demand-side schemes but because of them. Its government debt is now 200% of GDP, double what it was in 1996, and at the same time the Bank of Japan boosted the money supply by 158%. What good did any of this do? Japan’s NIKKEI today is half what it was in 1996, while its industrial output is higher by only 1%.

In this century so far America also has suffered a “lost decade” of sorts, due to the anti-prosperity schemes of both Keynesians and Monetarists; they’ve depressed the economic growth rate and saddled both current and future generations with massive and unparalleled deficit-spending and debt monetization. Together with a burgeoning mass of regulations, demand-side policies suffocate private-sector incentives to save, produce, invest and hire. Thus capitalists are on strike — and rightly so, since they face political assaults from both sides.

The evidence against Keynesians and Monetarists is undeniable (by most), so they’ve tried to deflect attention from their failures, either by claiming they’re trying to fix all the “problems” left over from the Reagan-inspired supply-side policies of the 1980s and 1990s (which is today’s Big Lie), or by claiming their demand-side schemes haven’t yet been enacted with sufficient intensity. Supposedly more of the same poison is required, perhaps a “QE-3″ or “QE-4,” say the Monetarists, or maybe more deficit-spending, say Keynesians like professor Caroline Heldman of Occidental College (Obama’s alma mater), who on June 3rd conceded to the Fox Business Network that capitalists today are on strike and reticent to invest, but whose only “solution” was to impose on these same capitalists still more deficit-spending and punitive taxation:

“There isn’t any evidence that there’s insufficient capital in private hands. We know that private firms have actually stockpiled more money than they ever have historically. What’s happening is that Washington didn’t spend enough with the economic stimulus plan.  It should have been about twice the size, and we didn’t put it into shovel-ready jobs, either.  So it’s not an issue of government spending too much but not spending enough, and not spending it on the right things. . . . Also, the vast majority of our problem with the structural budget deficits aside from the unfunded wars is the loss of tax revenue because of the economic crisis, and also because we’re just not taxing wealthy people their fair share. We stopped doing that about ten years ago.”

Heldman’s advice echoes the vile and deadly practice of blood-letting, wherein medieval quacks and witch-doctors insisted on taking more blood if the patient got weaker. Her approach also fits Einstein’s definition of “insanity” as “doing the same thing over and over again and expecting different results.” If true, Keynesians and Monetarists need to be institutionalized, not in academia or Washington, but in psychiatric wards.

Only recently have astute Americans begun to realize that the real choice isn’t between Democrats and Republicans, or even “liberals” and “conservatives,” but between genuine defenders of reason, liberty, and the law and proponents of sheer stupidity and tyranny. Perhaps a younger generation of policymakers might also come to realize how little real difference exists between the demand-side schemes of Keynesians and Monetarists – and how they can learn by revisiting honestly the methods and successes of supply-siders.


Testimony before 
The Subcommittee on Regulatory Affairs, Stimulus Oversight, and Government Spending
 
Of 
The House Committee on Oversight and Government Reform
 
United States
 House of Representatives 
February 16, 2011

My name is J.D. Foster. I am the Norman B. Ture Senior Fellow in the Economics of Fiscal Policy at The Heritage Foundation. The views I express in this testimony are my own, and should not be construed as representing any official position of The Heritage Foundation.

At best, stimulus efforts based on government spending and tax cuts with little or no incentive effects have done no harm. At best. It is quite possible most of these efforts over the past couple of years have slowed the recovery while adding hundreds of billions of dollars to the national debt.

The record is all the more unfortunate because it is possible for a President and Congress to work together to stimulate the economy to faster growth during and after a recession. They can do so by improving incentives to produce and to work: for example, by reducing regulations and tax distortions. They can do so by reducing the uncertainties surrounding future policy. They can do so by expanding foreign markets for domestic goods and services. Recent efforts to stimulate the economy have been unsuccessful because they did little or none of these things. Regulations have increased. Uncertainty has increased. Tax distortions have been left in place or even increased in some areas. And efforts toward free trade have been anemic, at best.

Stimulus can work, but it has not worked because the Administration took another approach, emphasizing tax relief with little or no incentive effects combined with massive increases in spending. The President inherited a ballooning budget deficit and opted to grow it further. At best, this would be expected to be ineffectual. At best, because the resulting increased deficits infused economic decision-making with even more uncertainty about the consequences of massive deficit spending and how and when government will act to restore fiscal sanity.

Fortunately, the economy is showing clear signs of sustained recovery; uneven recovery to be sure, stronger in some areas than others both geographically and by industry, but recovery nonetheless. Despite the tremendous blows from the financial crisis and all that it entailed, the underlying strengths of our free market system once again are at work, giving expression to the vitality, energy, and innovation of the American people. Make no mistake: Our economy is recovering despite—not because of—the actions taken in Washington to grow it.

Signs of Taking the Wrong Road

The heart of the Administration’s approach to stimulus is the equivalent of fiscal alchemy. Alchemy, “the art of transmuting metals,” refers specifically to turning base metals like lead into gold. Fiscal alchemy is the attempt to turn government deficit spending—whenever, wherever, and on whatever—into jobs. Regarding near-term stimulus, it is not a matter of how wisely or foolishly the money is spent. It is not a matter of how quickly or slowly the money is spent. It is not a matter of whether some is saved or not—any more than the phase of the moon or adding a bit more wolfsbane or a stronger electric current enhances the prospects for lead to become the substance of an alchemist’s dreams.

The basic theory of demand-side stimulus is beguilingly simple. The theory observes that the economy is under performing and total demand is too low, and thus total supply needed to meet that demand is too low. It would appear obvious enough, then, that a solution is to increase demand by deficit spending and rising supply will naturally follow. The net of government spending over tax revenues adds to total demand. Increase the deficit and you increase demand, supply naturally follows, and voila: the economy is stronger and employment is up. One wonders then why government should not simply increase spending much, much more and create instant full employment.

Why, indeed. The answer, as is now obvious, is that this policy does not work for the simple reason that government must somehow fund this additional spending, and it does so by borrowing. Suppose you take a dollar from your right pocket and transfer it to your left pocket. Do you have a new dollar to spend? Of course not.

Or suppose you pour a bucket of water into a bathtub. You would expect the level of the water to rise. But where did the water in the bucket come from? It came from dipping it into the bathtub. You may make a splash, but when the water settles, in terms of the water level nothing will have changed.

An increase in government borrowing to finance an increase in deficit spending produces one of two ensuing events, either of which (or in combination) leaves total demand unchanged. First, the increase in government borrowing can mean a reduction in the amount of saving available for private consumption and private investment. Government demand goes up, private demand goes down, total demand is unchanged.

Alternatively, the increase in government borrowing may be financed not by reducing private borrowing but by an increase in net inflows of foreign saving—either a reduction in the gross outflows of U.S. saving or an increase in the gross inflows of foreign-sourced saving. Total demand remains unaffected, however, because the balance of payments still balances, and so the increase in net inflows of saving is matched by an increase in the net inflows of goods and services—the increase in the trade deficit offsets the increase in deficit spending.

Underlying this simple confusion surrounding demand-side stimulus is that the theory ignores the existence of a well-developed financial system, the job of which fundamentally is to direct private saving into private consumption, private investment, or government deficit spending. Even in the past few years, when the financial system has worked poorly in the sense that institutions have failed, markets struggled, and the direction of investment dollars has been less than stellar, the markets still managed to take every dollar of saving and direct it toward a borrower willing to take it and use it. Demand-side theory presumes the existence of financial markets, as government must rely on those markets to issue debt to finance deficit spending, but then ignores that absent the additional government borrowing, markets would have directed the saving to other purposes, which would have added to total demand in the same amount.

These economic relationships are analogous to the law of conservation of energy, which says that energy can be neither created nor destroyed in a closed system, but can only be transformed from one state to another. If we exclude the possibility of cross-border capital flows, then the closed system is the domestic economy and the energy conserved is the amount of saving available. If we allow for the possibility of cross-border capital flows, then the closed system is the global economy and the energy conserved is the amount of domestic saving augmented or diminished by the second closed system of the balance of payments.

You Could Be a Demand-Sider If…

There are some tell-tale signs that one has intentionally or inadvertently fallen prey to demand-side stimulus alchemy. One such sign arises when one engages in discussions about multipliers. The multiplier principle is simple enough—if government deficit spending rises by a dollar, does total demand rise by more than a dollar? Make no mistake. One must first accept the possibility that government deficit spending can boost total demand before one embarks on an empirical investigation of multipliers. First, one must believe that lead can be turned into gold to investigate the advantages of incantations over potions.

Another tell-tale sign is references to whether amounts are saved or spent. For example, one argument in favor of direct spending over broad-based tax relief is that every dollar of spending is spent, whereas some portions of a tax cut are saved, and the higher the income of the tax cut recipient, the more from a tax cut is likely to be saved. A related example is the argument that the additional cash income from extending the Unemployment Insurance program for the long-term unemployed is highly likely to be spent virtually in toto, suggesting that such a policy is particularly efficacious stimulus.

Whether the monies resulting from deficit spending are saved or spent matters not a whit to the immediate level of economic activity. If these monies are spent, then private demand must fall by the amount borrowed. If the monies are saved, then government debt is higher and private saving is higher, yet total demand is again unmoved.

One of the original motivations for the demand-side theory of fiscal stimulus was the observation that private saving might be parked in unproductive locations. We hear echoes of this today when, for example, the President refers to the need for private companies to employ their enormous cash hoards to increase investment and employment.

For example, during the Great Depression many citizens took to stashing their saving around the house as faith in the security of private financial institutions crumbled. They would bury it in a coffee can in the back yard, or perhaps sew twenty-dollar bills into the lining of a suit. Clearly, in these cases, the saving has been withdrawn from the financial system and so total demand as commonly measured fell. However, this cautious financial behavior lends no support for increased deficit spending. There is nothing about a government going deeper into debt that is going to instill such confidence in a coffee can-based saver as to entice that person to disinter his or her cash just to make it available to the government.

Unless the saving has been withdrawn entirely and held in cash, it remains part of the financial system, and banks and other financial institutions are lending those monies to someone else to use. Companies today with large cash hoards are choosing not to invest these monies themselves in expanded productive capacity; however they are not locking them in the Chief Financial Officer’s office safe, either. These corporate savings are deposited with and deployed by the financial system.

Why Are Demand-Siders Not Quaking?

The Congressional Budget Office recently released its analysis of the near- and intermediate-term budget picture showing a budget deficit for 2011 of almost $1.5 trillion or 9.8 percent of our economy.[1] However, under the CBO forecast based on current law, the deficit drops dramatically to 7 percent of our economy by 2012 and it drops a similar amount as a share of the economy by 2013. The Administration’s Mid-Session Review released last July showed a similar pattern.[2] (This testimony was written prior to the release of the President’s Fiscal Year 2012 Budget, which presumably will show the same general pattern.

In light of these forecasts, if the Administration and other demand-side stimulus proponents believed their own theory they would today be concerned to the point of apoplexy. Rather than forecasting reasonably good growth for 2011 and 2012, they would be forecasting a growth recession at best, and more likely a return to recessionary conditions.

The measure of the amount of demand-side stimulus is whether the deficit is rising or falling relative to the size of the economy. From 2008 to 2009, the ratio of the deficit to Gross Domestic Product (GDP) rose from 3.2 percent to 9.9 percent. This 6.7 percent massive dose of fiscal stimulus represented the largest deficit burst since 1942. It was half again as large as the next biggest dose in the post-war era—a 4.4 percentage point burst in 1949. If demand-side stimulus worked, the economy’s growth today should be China-esque.

On the flip side, a 5.5 percentage point drop in the deficit-to-GDP ratio from 9.8 percent in 2011 to 4.3 percent in 2013, as CBO forecasts, should raise loud alarms amongst demand-side supporters. If demand-side deficit-soaring stimulus works to boost the economy, then a rapidly shrinking deficit should undercut the economy. Yet, no such concern is in evidence. Instead, the Administration forecasts a steady improvement in output and employment. The Administration apparently no longer believes in demand-side stimulus.

To be clear, a rapid decline in the budget deficit through a combination of strong spending restraint and revenue recovery through economic growth is exactly what the nation needs today. The point, in the current context, is merely that demand-side supporters apparently expect as little downward effect from the rapid drop in the deficit’s share of our economy as we saw stimulative pressures when the deficit began its historic ascent.

The Fall, Rise, and Fall of Demand-Side Stimulus

It was not that long ago that demand-side stimulus was generally understood to be ineffective. After a couple decades of unsuccessful attempts at fiscal fine-tuning in the 1950s through the 1970s, not just in the United States but around the world, a reluctant consensus for abandoning these policies developed. For some reason, this consensus fell apart during the recession President George W. Bush inherited from President Clinton. While Bush emphasized the importance of rate reductions, it also became acceptable again to talk about “putting money in people’s pockets so they could spend.” Demand-side stimulus was back, and as ineffective as ever as we learned in 2001 and 2002.

The demand-siders remained ascendant as President Obama took office and as yet another recession unfolded. Facing a choice of cutting tax rates à la first President Reagan in 1981 and then Bush in 2001 and 2003, or returning to the deficit spending policies of the early post-war period, Obama and his congressional allies naturally chose not to emulate their ideological opponents. They chose to increase mightily an already rapidly growing spending bulge and budget deficit. If ever this policy was going to work, this was it. It failed.

That demand-side stimulus has again failed is increasingly obvious even to those who advanced the policy, some reluctantly, some with gusto. It is safe to predict that many of those who remained silent in opposition will soon come out and say they opposed this policy all along. It is even safe to predict that some of the loudest proponents will recant in some future year, likely asserting in all seriousness and hoping no one will check, that they knew all along that the President’s demand-side stimulus policy was doomed. It matters far less that these voices will still have currency in certain quarters than that, for awhile at least, demand-side stimulus policies will again be tabled as effective only in growing the national debt.

Stimulus That Would Have Helped

There is much the last Congress could have done to stimulate the economy. A simple example is that Congress might have acted quickly, rather than waiting until the last minute, to extend the Bush tax cuts through 2012. The uncertainty surrounding tax policy slowed the recovery.

The Congress could have resisted the temptation to tinker. For example, it could have resisted the temptation of the first-time homebuyer’s credit, which on balance slowed the recovery in the housing sector by first confusing and then slowing the price discovery process. To be sure, home sales at first increased, and then collapsed, and in the meanwhile housing markets had a powerful new source of market noise to filter out as they searched for proper price levels.

The Congress and the President could have halted the storm of new regulations and threatened regulations, beginning but not limited to Obamacare. According to estimates by my colleague James Gattuso, the cost of the federal regulatory burden now tops $1 trillion—before Obamacare.[3]

Above all, Congress could have focused its fiscal policies on the sources of recovery and growth, rather than give in to the perennial delight of increasing spending on politically favored causes. One example among many is that the Congress could have cut the corporate income tax rate from 35 percent to 25 percent for a decade for about the same deficit impact as all the so-called fiscal stimulus. President Obama acknowledged in his State of the Union address that the corporate tax rate is too high. Had he acknowledged this two years ago and pressed for a reduction at that time, many more fellow citizens would today have gainful employment.

Because the budget deficit today is so enormous, the nation’s policy options aside from halting or reversing the regulatory onslaught are severely limited, confined essentially to expanding free trade and cutting spending deeply to restore fiscal balance. Near-term efforts to cut non-security discretionary spending are essential, but must be seen as but the first step in a steady march against government spending, including reforming the major entitlement programs to stabilize these programs and to stabilize government spending. The best Congress and the President can do now in terms of fiscal policy is to get the nation’s fiscal house in order by cutting spending, repeatedly.

The impact of supply-side economics on Toronto’s rising house prices


David Amborski is director and Frank Clayton is senior research fellow at Ryerson University’s Centre for Urban Research and Land Development. Dr. Clayton is author of the recent report titled Why There Is a Shortage of New Ground-Related Housing in the GTA.

The housing market in the Greater Toronto Area is hotter than at any time since the late 1980s. Prices of existing and new ground-related homes (single detached and semi-detached houses and townhouses) are rising rapidly.

There has been widespread media coverage of the demand factors, low interest rates and rapid population growth that have contributed to the rising price of housing. According to a recent poll conducted by Angus Reid, the public as a whole seems to understand and support the role that demand plays in high regional housing prices.

Alas, home prices are not determined by demand alone. Supply is a big part of the equation.

Normally, in the private economy, when demand for a product or service picks up, prices begin to rise and suppliers respond by increasing supply, which in turn, moderates the initial price increase. While homebuilders are like other suppliers in their desire to increase the production of homes, they are unable to do so as there is a severe shortage of sites in the GTA for new single and semi-detached houses and townhouses.

Unlike the other requirements for homebuilding – labour, materials and capital – the supply of serviced land rests on the shoulders of municipal governments.

Land-use planning policies enforced by the province of Ontario favour the intensification of sites in built-up urban areas, especially mixed-use developments near existing transit nodes. As a result, in the past decade, more than 143,000 units, mostly condominiums for owner or renter occupancy, have been started in the GTA. This ample supply of sites has moderated price increases for these types of residential units.

Circumstances have been quite different for single and semi-detached houses and townhouses, which are mainly found in the “905” suburban area code.

Beginning in 1989, the province required municipalities to maintain at least three years’ supply of serviced or readily serviceable land for a range of housing types.

The current provincial government has stopped monitoring and enforcing this serviced-lot supply requirement and the policy is being disregarded or incorrectly interpreted by most GTA municipalities.

The previous ample supply of sites for houses has long been exhausted and is not being replenished in anywhere near the numbers required to meet current, let alone future, demand.

As a result, starts of single and semi-detached houses and townhouses in the GTA have fallen by half, dropping from about 30,000 units in 2001-2003 to about 15,000 units in 2013-2014. This is despite very strong demand for this type of housing.

The province, through its imposition of its Growth Plan for the Greater Golden Horseshoe and the Greenbelt and the creation of the Metrolinx regional transit authority, is effectively the regional planning body for the GTA. As such, the province should immediately begin monitoring and enforcing its own requirement that the 905 municipalities maintain at least a three-year supply of serviced and readily serviceable land to meet the current and expected future demand for ground-related housing.

Without a proactive provincial government, there is no hope for relief from high prices for ground-related housing in the GTA.

需求学派祸害了美国经济

2011年06月15日

Richard M. Salsman 

最新数据证明,2009-2011年这段时期的衰退后经济复苏堪称美国有史以来最弱的一场复苏,自从衰退在2009年年中结束后,美国的实际国内生产总值(GDP)增长率只有5%。相比之下,第二次世界大战后发生的九次经济衰退的可比增长率平均为9%。

在上述这些过往的复苏中,私营经济的就业人数平均增长5.7%,而这一次只有0.9%。过往的经济复苏中,失业率平均下降了1.5个百分点,而这一次最多只下降了三分之一个百分点。也许这还不是最糟糕的。过往的经济复苏,连续失业时间平均增加1.5周,而这一次增加了15.5周,达到史上最长的39周。

许多为奥巴马政府和伯南克领导下的美联储辩护的人声称,最近这轮经济复苏之所以力度如此之弱,是由于之前的经济衰退程度太深所致。“这条沟(指经济衰退)要比我们预想的更深。”奥巴马本人很可能会这样说,因此我们要花更长的时间才能爬出来。但历史经验正好相反:“沟”越深,复苏的力度往往越强;“沟”越浅,复苏力度越弱。

眼下美国经济复苏乏力,再怎么样也无法否认这点。而在此之前发生的那场衰退,其力度之惨烈甚至被冠以“2007-2009大衰退”之名。由此可见,奥巴马和伯南克并不仅仅是“做对的事情太少”,而是没有一件事情做得对。然而仍然有许许多多的经济学家执迷不悟,主张增加赤字、扩大开支,以及/或是进一步增发钞票。

想想看,为了“成就”如今这软绵绵的复苏,美国公共债务激增了54%(从2007年末衰退开始时的9.3万亿美元猛增到如今的14.3万亿美元),而美联储的货币基础则增长211%(从8,250亿美元增至2.5万亿美元),这些增发的货币潜伏在系统内,可能成为加剧通胀的助推剂。这些吓死人的数字,难道仅仅是合理和善意的公共政策因为疏忽造成的结果?但真相是,它们是两种受到高度赞扬、广泛推崇但却致命的政策理论的必然结果。这两种理论便是凯恩斯主义和货币主义。

这两种流派虽然在学术上互为竞争关系。但实际上,两者之间所存在的共同点却要比各自的拥护者所承认的多得多。两种流派都执迷于开支和消费,也就是经济的“需求面”,但却忽视和贬低无比重要的供应面。推动经济蓬勃发展从来都不是只靠“消费者”自身,而是靠储蓄者、投资者、创新者和生产者。

然而凯恩斯主义者声称自由的经济存在“生产过剩”和消费不足的风险,货币主义者则声称由于货币供应不足而存在“通缩”的风险。凯恩斯主义者总是迫切地鼓吹他们所谓的“总需求不足”理论,而典型的解决办法是政府增加赤字、扩大开支,也就是他们兜售的“经济刺激”政策。

同样的,货币主义者总是想要应对想象中需求受到的威胁,按照这些人所说,威胁正是货币创造不足所致。一旦有必要,这些人就会坐直升机上天把需要的钱撒出去,他们称这种政策为“定量宽松”。然而这类针对需求面的策略,无论是凯恩斯派的增加赤字-开支,还是货币派的开动印钞机,都只会腐蚀企业家和生产力的威力。例如,眼下已变得危险的长时间失业状况(39周)就是一再延长失业救济领取期限的结果,凯恩斯主义者鼓吹用这种方式来制造更多消费,而不是更多的工作或是产出。

真实的情况是,按照反对凯恩斯主义的学派认为的,消费不过是生产的结果,而不是起因。消费等同于消耗或破坏财富,而不是再次创造财富。同样的,反货币主义的学派认为,由垄断性的中央银行制造的纸钞法币(或银行准备金)并不是在创造真正的财富,实际上多半情况下这种行为的后果,即通货膨胀,只会破坏财富的制造过程。因为通胀会扭曲价格信号,同时从那些对持有货币深信不疑的人身上夺走购买力。

可悲的是,美国政策制定者们似乎热衷于效仿日本同行在20年前开始执行的那套疯狂政策:天文数字级的赤字-开支,外加狂印钞票。凯恩斯主义者和货币主义者的政策很容易玩出火来,就像是病毒一样。日本经济自实施上述政策后一直停滞不前。之所以如此,并非需求面政策“回天乏力”,其实原因就出在这些政策身上。眼下日本的政府债务已达到GDP的两倍,较1996年增长了一倍,与此同时日本央行将货币供应量提升了158%。这样做有何好处?如今日经指数只有1996年的一半,工业产值只增长了区区1%。

本世纪以来,美国经历了同样的“失落的十年”之苦,问题就出在凯恩斯主义和货币主义者制造的种种不利于经济繁荣的政策上。他们的所作所为遏制了经济增长,他们制造了规模空前的赤字-开支和货币债务,让当前一代和下一代美国人民背上沉重的包袱。与急剧膨胀的监管一道,需求面政策妨碍了促使私营经济进行储蓄、生产、投资和雇佣的激励因素发挥作用。于是乎,资本家们撂下了摊子——这样做没错,因为他们面临政治上的双重夹击。

供给学派理论概述

  供给学派是20世纪70年代在美国兴起的一个经济学流派。该学派强调经济的供给方面,认为需求会自动适应供给的变化,因而得名。

  供给学派认为,生产的增长决定于劳动力和资本等生产要素的供给和有效利用。个人和企业提供生产要素和从事经营活动是为了谋取报酬,对报酬的刺激能够影响人们的经济行为。自由市场会自动调节生产要素的供给和利用,应当消除阻碍市场调节的因素。供给学派的主要代表人物之一拉弗供给经济学解释为:“提供一套基于个人和企业刺激的分析结构。人们随着刺激而改变行为,为积极性刺激所吸引,见消极性刺激就回避。政府在这一结构中的任务在于使用其职能去改变刺激以影响社会行为”。

供给学派的兴起

  第二次世界大战后,凯恩斯主义占据了资产阶级经济学的统治地位,西方国家普遍依据凯恩斯的理论制订政策,对经济进行需求管理, 并取得了一定的效果。于是凯恩斯主义盛极一时。但是,凯恩斯主义人为地扩大需求,最后导致70年代西方经济出现生产呆滞、失业严重,同时物价持续上涨的“滞胀”局面。于是西方经济学界纷纷向凯恩斯主义提出挑战,并研究替代的理论和政策。供给学派就是在这样的背景下兴起的。

经济学派
重农学派
古典经济学
新古典经济学
奥地利学派
奥地利经济学派
新奥地利经济学派
边际效用学派
德国历史学派
弗莱堡学派
法国古典政治经济学
供给学派
官房学派
公共选择学派
功利主义
货币学派
哈佛学派
海派经济学
经济历史学派
剑桥学派
激进经济学派
经济浪漫主义学派
经济自由主义
凯恩斯主义
洛桑学派
伦敦学派
李嘉图派社会主义者
李嘉图学派
马克思主义政治经济学
瑞典学派
数理经济学派
新制度学派
新古典综合学派
新剑桥学派
新自由主义
新凯恩斯主义
新历史学派
新经济地理学派
新制度经济学派
理性预期学派
芝加哥经济学派
制度学派
重商主义
资产阶级庸俗政治经济学
资产阶级经济学
古典自由主义
成本学派
[编辑]

  该学派的先驱者是加拿大籍、美国哥伦比亚大学教授芒德尔。70年代初,他多次批评美国政府的经济政策,提出同凯恩斯主义相反的论点和主张。1974年他反对福特政府征收附加所得税控制物价的计划,主张降低税率、鼓励生产,同时恢复金本位、稳定美元价值来抑制通货膨胀

  芒德尔的论点引起拉弗和万尼斯基的注意和赞赏,拉弗进一步研究并发展了芒德尔的论点。当时的美国国会众议员肯普也很重视芒德尔的主张,他任用罗伯茨为他拟定减税提案,聘请图尔进行减税效果的计量研究。

  70年代后半期,拉弗,万尼斯基、罗伯茨等利用《华尔街日报》广泛宣传他们的论点。肯普也在国会内外竭力鼓吹减税能够促进经济增长。1977年 ,肯普与参议员罗斯联名提出三年内降低个人所得税30%的提案。这个提案虽然未经国会通过,但在社会上产生了很大影响。

  万尼斯基所著《世界运转方式》被认为是供给学派的第一部理论著作,吉尔德的《财富与贫困》阐述供给学派的资本和分配理论,被誉为是供给经济学的第一流分析。70年代末,供给学派在美国经济学界已成为独树一帜的学派。

  在学派形成过程中,有些倡导者如费尔德斯坦埃文斯等在一些论点和政策上同拉弗、万尼斯基、肯普等人的意见差异很大。因为费尔德斯坦、埃文斯的观点比较温和,持折衷论,西方经济学界称他们为温和派,称拉弗、万尼斯基、肯普等为激进派。但后者则自称是供给学派正统派,西方各界通常也把后者作为供给学派的代表。

供给学派的观点和主张

  供给学派并没有建立其理论和政策体系,只是学派的倡导者对于资本主义经济产生“滞胀”的原因及政策主张有些共同的看法。

  供给学派认为,1929~1933年的世界经济危机并不是由于有效需求不足,而是当时西方各国政府实行一系列错误政策造成的。萨伊定律完全正确,凯恩斯定律却是错误的。

  吉尔德坚持说,就全部经济看,购买力永远等于生产力;经济具有足够的能力购买它的全部产品,不可能由于需求不足而发生产品过剩。拉弗极力强调萨伊定律的重大意义 ,他指出萨伊定律不仅概括了古典学派的理论,而且确认供给是实际需求得以维持的唯一源泉。供给学派认为政府不应当刺激需求,而应当刺激供给。

  供给学派重新肯定萨伊定律以后,进而确认生产的增长决定于劳动力和资本等生产要素的供给和有效利用,在生产要素中资本至关紧要。资本积累决定着生产增长速度,应当鼓励储蓄和投资。

  供给学派认为,在市场经济条件下,个人和企业提供生产要素和从事经营活动都是为了谋取报酬或利润。因此,对报酬和利润的刺激会影响经济主体的行为。对实际工资的刺激将影响劳动力的供给;对储蓄和投资报酬的刺激会影响资本的供给和利用。充分发挥市场机制,能够使生产要素供需达到均衡和有效利用。应当消除不利于生产要素供给和利用的因素。

  供给学派指出,政府的经济政策是经济主体经营活动的刺激因素,其中财政政策最为重要。在分析经济政策对行为的影响时,供给学派反对凯恩斯主义只注意政策对经济主体收入和支出的效果,而是强调政策对生产活动的作用。

  供给学派着重分析税制对生产要素供给和利用的效果。他们指出,经济主体从事经营活动所关心的并不是获得的报酬或利润总额,而是减去各种纳税后的报酬或利润净额。在累进税制条件下,边际税率又是关键因素。因为经济主体是否多做工作,或增加储蓄和投资,要看按边际税率纳税后增加的净报酬是否合算。他们认为税率影响经济主体行为是通过相对价格变化实现的,税率提高,纳税后净报酬减少。就劳动力看,这意味着休闲对做工的价格下降,人们就会选择休闲而不去做工,劳动力供给就会减少。就资本看,这意味着消费对储蓄和投资的价格下降,人们就乐意把收入用作消费而不用作储蓄和投资,资本供给就会减少。此外,经济主体为了逃避高税率,还把经济活动从市场转入地下。这些都会使生产要素供给减少,利用效率降低,使生产下降。

  供给学派进而分析税率与税收的关系。因为税收是税率与税收基础的乘积,税率变动既然影响生产,就必然影响税收。拉弗首次把税率与税收的关系制成模型,画在直角坐标图上,这就是以拉弗命名的拉弗曲线

  减税,特别是降低边际税率能促进生产增长,并可抑制通货膨胀。拉弗、万尼斯基、肯普等宣扬正是高税率挫伤了人们的劳动热情,阻碍了个人和企业储蓄与投资。这就必然导致生产率增长缓慢、生产呆滞,出现商品供给不足、物价上疏。这时再加上人为地扩大需求,通货膨胀势必加剧。通货膨胀又使储蓄和投资进一步萎缩,生产更加呆滞;还使纳税人升进高税率等级,而实际收入并未增加,纳税负担因而更重。

  因此,供给学派竭力主张大幅度减税,特别鼓吹降低边际税率的作用。他们认为减税能刺激人们多作工作,更能刺激个人储蓄企业投资,从而大大促进经济增长,并可抑制通货膨胀。他们还宣称,减税后政府税收不致减少,还会增多。即使出现财政赤字,对经济也无关紧要。经济增长后,赤字自然缩小和消失。

  供给学派认为,政府支出不论是公共支出还是转移支付,都或多或少起着阻碍生产的作用。公共支出中有些是浪费资源,有些虽然对经济有益,但效率很低。因此,他们主张大量削减社会支出,停办不必需的社会保险福利计划,降低津贴和补助金额,严格限制领受条件。

  供给学派虽然同意货币主义的基本观点,但在控制货币数量增长的目的和措施上,同货币学派大相径庭。供给学派认为,控制货币数量增长的目的不应只是与经济增长相适应,而是为了稳定货币价值。货币价值保持稳定,人们的通货膨胀心理就会消失。在安排货币收入时,人们就乐意保存货币,不去囤积物资,选择生产性投资,不做投机性投资。同时,货币价值稳定又是保证财政政策,发挥促进经济增长的必要条件。如何保持货币价值稳定,拉弗、万尼斯基、肯普等坚持必须恢复金本位制

对供给学派的评论

  供给学派的论点和主张受到西方经济学界各方关注。凯恩斯主义萨缪尔森认为,它既没有经济史上的有力证据,又缺乏理论分析上的合理推断。货币学派虽然对一些论点表示赞同,但认为它并没有提出有效解决美国社会经济问题的分析结构。进步学者的评论更加尖锐。

  评论者都不同意拉弗、万尼斯基、肯普等关于美国税制已经进入禁区的论断,认为缺乏历史和现实的验证 。对于供给学派所说减税不会导致出现财政赤字,即使发生赤字对经济也无任何妨碍,赤字会自行消失的观点,更认为是纯属无稽之谈。评论者一致指出,降低边际税率是为富人谋利。因为全面降低累进税率,高收入阶层获得减税的好处要比低收入阶层多 ,削减社会支出则使低收入阶层直接受到损失。

  凯恩斯主义者阿罗卡恩等指出,政府干预经济是社会经济发展的需要,并非政治家们的任意设计。二次大战后西方国家在资源分配和利用、保持经济稳定、收入再分配等方面的干预和调节,对经济发展起了巨大的促进作用。制订生产安全、环境保护等法律条例,虽然增加了企业负担,但保护了社会利益。

  一些进步学者批评供给学派过分强调资本投资在经济增长中的作用。并着重指出,在资本主义条件下,资本投资既促进经济增长,又造成生产过剩危机。他们还反对供给学派把投资不足作为西方经济出现“滞胀”的原因,指出70年代美国企业固定资本投资占国民生产总值的比重并不比60年代低。

  评论者认为,恢复金本位制将大大缩减货币供应量的增长,使经济陷入长期衰退。指出货币历史表明金本位并不能保证物价稳定。1981年美国国会成立的专门研究恢复金本位问题的“黄金委员会”,经过半年多的争辩,最后否定了供给学派的主张。供给学派虽然遭到西方经济学界的评论,但也给予西方经济思想以有力冲击,对西方一些国家特别是美国的经济政策也有很大的影响。

供给学派的影响

     供给学派对美国政府的经济政策的影响很大。1981年,新上台的里根总统提出的“经济复兴计划”开头就声明,他的计划与过去美国政府以需求学派为指导思想的政策彻底决裂,改以供给学派理论为依据。1985 年,里根总统在第二任期开始时宣称,他将继续实施并扩大原订计划。但是,美国经济并没有象计划所预期的那样顺利发展,大部分目标也未能实现。计划实施不久,美国经济就陷入第二次世界大战后最严重的一次经济危机。特别是联邦财政连年出现巨额赤字,导致高利率和美元高汇价,又使对外贸易连年出现创纪录赤字。所以几年来除了几位倡导者仍在宣扬供给学派获得巨大胜利外,信仰和赞赏的已日趋减少。




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