Now let’s use the tools of welfare economics to measure the
gains and losses from a tax on a good. To do this we must take into account how
the tax affects buyers sellers and the government. The benefit received by
buyers in a market is measured b consumer surplus the amount buyers are willing
to pay for the good minus the amount they actually pay for it. The benefit
received by sellers in a market is measured by producer surplus the amount
sellers receive for the good minus their costs. These are precisely the
measures of economic welfare we used in.
What about the third interested party the government? If T is
the size of the tax and is the quantity of the good sold then the government
gets total tax revenue. It can use this tax revenue to provide services such as
roads police and public education or to help the needy. Therefore to analyze
how taxes affect economic well-being we use tax revenue to measure the
government’s benefit from the tax. Keep in mind however that this benefit actually accrues not to
government but to those on whom the revenue is spent.
That the government’s tax revenue is represented by the
rectangle between the supplyn and demand curves. The height of this rectangle
is the size of the tax and the width of the rectangle is the quantity of the
good sold. Because a rectangle’s area is its height times its width this
rectangle’s area is which equals the tax revenue.
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