CAS EC 101 Lecture Notes - Lecture 6: Deadweight Loss, Economic Surplus, Market Distortion

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CAS EC 101 Full Course Notes
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CAS EC 101 Full Course Notes
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The previous topic introduced our de nitions for consumer, producer, and total surplus. We used those to show that free markets maximize total surplus: the equilibrium quantity of a good or service provided is e cient in the sense of social welfare. And if so, how bad is the damage: social surplus under a tax. Recall our supply-and-demand diagram showing the impact of a tax Let us divide parts of the graph and conduct surplus analysis using our de nitions of consumer and producer surplus. We de ned consumer surplus to be the area between willingness to pay (demand curve) and the price consumers actually pay. Before the tax, they pay price p1, and so their consumer surplus before the tax is a+b+c. After the tax, the price consumers pay rises to pb. Hence the tax reduces their consumer surplus to area. Similarly, with no tax, producers receive price p1 and get producer surplus d+e+f.

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