ECON 201 Lecture Notes - Lecture 9: Deadweight Loss, Economic Surplus

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14 Nov 2016
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Before the tax, consumer surplus is a+b+c or top half triangle of big triangle: producer surplus is d+e+f. After tax, consumer surplus shrinks to a or part from price plus tax to edge of curve: producer surplus is f. Tax revenue is b+d in middle where tax is imposed. We defined the total surplus before as consumer surplus plus producer surplus. If there is a tax that is used to pay for government services, the revenue from that tax also contributes to total surplus. Total surplus = consumer surplus + producer surplus + tax revenue. We know that in an ideal market total surplus is maximized where supply intersects demand. Any government intervention that moves the equilibrium away from the market equilibrium will reduce total surplus. The decrease in total surplus resulting from a policy intervention is called deadweight loss.

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