When a good is taxed buyers and sellers of the good share
the burden of the tax. But how exactly is the tax burden divided? Only rarely
will it be shared equally. To see how the burden is divided consider the
impact of taxation in the two markets. In both cases figure shows the initial
demand curve the initial supply curve and a tax that drives a wedge between the
amount paid by buyers and the amount received by sellers. Not drawn in either
panel of the figure is the new supply or demand curve. Which curve shifts
depends on on whether the tax is levied on buyers or sellers. As we have seen
this is irrelevant for the incidence of the tax. The difference in the two
panels is the relative elasticity of supply and demand.
A tax in a market with very elastic supply and relatively
inelastic demand. That is sellers are very responsive to changes in the price
of the good so the supply curve is relatively flat whereas buyers are not very
responsive so the demand curve is relatively steep. When a tax is imposed on a
market with these elasticities the price received by sellers does not fall much
so sellers bear only a small burden. By contrast the price paid by buyers rises
substantially indicating that buyers bear most of the burden of the tax.
A tax in a market with relatively inelastic supply and very
elastic demand. In this case sellers are not very responsive to change the in
the price so the supply curve is steeper whereas buyers are very responsive so
the demand curve is flatter. The shows that when a tax is imposed the price
paid by buyers does not rise much buy the price received by sellers falls
substantially. Thus sellers bear most of the burden of the tax.
A general lesson about how the burden of a tax is divided. A
tax burden falls more heavily on the side of the market that is less elastic.
Why is this true? In essence the elasticity measures the willingness of buyers
or sellers to leave the market when conditions become unfavorable. A small
elasticity of demand means that buyers do not have good alternatives to
consuming this particular good. A small elasticity of supply means that sellers
do not have good alternatives to producing this particular good. When the good
is taxed the side of the market with fewer good alternatives cannot easily
leave the market and must therefore bear more of the burden of the tax.
We can apply this logic to the payroll tax discussed in the
previous case study. Most labor economists
believe that the supply of labor is much less elastic than the demand.
This means that workers rather than firms bear most of the burden of the
payroll tax. In other words the distribution of the tax burden is not at all
close to the fifty-fifty split that lawmakers intended.
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