Supply demand elasticity deadweight loss all this economic
theory is enough to make your hard spin. But believe it or not these ideas go
to the heart of a profound question: How big should the government be? The
debate hinges on these concepts because the larger the deadweight loss of
taxation the larger the cost of any government program. If taxation entails
large deadweight losses then these losses are a strong argument for a leaner
government that does less and taxes less. But if taxes impose small deadweight
losses then government programs are less costly than otherwise might be.
So how big are the the deadweight losses of taxation? This
is a question about which economists disagree. To see the nature of this
disagreement consider the most important tax in the U.S economy: the tax on
labor. The Social Security tax the Medicare tax and to a large extent the
federal income tax are labor taxes. Many state
goverments also tax labor earnings. A labor tax places a wedge between
the wage that firms pay and the wage that workers receive. If we add all forms
of labor taxes together the marginal tax rate on labor income the tax can the
last dollar of earnings is almost 50 percent for many workers.
Although the size of the labor tax is easy to determine the
deadweight loss of this tax is less straightforward. Economists disagree about
whether this 50 percent labor tax has a small or a large deadweight loss. This
disagreement arises because eonomists hold different views about the
elasticity of labor supply.
Economists who argue that labor taxes do not gretty distort
market outcomes believe that labor supply is fairly inelastic. Most people they
claim would work full time regardless of the wage. If so the labor supply curve
is almost vertical and a tax on labor has a small deadweight loss.
Economists who argue that labor taxes are highly distorting
believe that labor supply is m
ore
elastic. They admit that some groups of workers may supply their labor in elastically but claim that many other groups respond more to incentives.
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