EC120 Lecture Notes - Lecture 8: Economic Surplus, Joule, Laffer Curve

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16 Dec 2015
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EC120 Full Course Notes
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Tax put on buyers - demand curve shifts to the left by the size of tax. Tax put on sellers - supply curve shifts t the left by that amount. The price paid by buyers (up) and price received by sellers (down) [difference. In the end - buyers and sellers share the burden of the tax, regardless of how is the tax] it is levied. To understand we use the tools of welfare economics to measure the gains and losses from a tax on a good o. Buyers measured by change in consumer surplus (-) measured by change in producer surplus (-) Price paid by buyers rises from p1 to pb, consumer surplus now = area a. Price received by sellers falls from p1 to ps, producer surplus now = area f. Quantity sold falls from q1 to q2, gov. collects tax revenue = area b+d. Total surplus with tax, we add consumer surplus, producer surplus, and tax.

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