Consider placing a tax on a good that has a positive benefit externality of MEB=3 where MSC=2Q and MPB = 21-Q. a. Compare the equilibrium outputs with (i) no tax, (ii) with a Tax of $3, and (iii) at the social optimu. b. In this case, what happens to DWL when a tax is added? Show and explain your reasoning.

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A: Externality refer to the benefit or harm of an activity caused by any firm or an individual

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A: Socially optimal equilibrium is reached where social demand equals social supply.

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A:

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A: Deadweight loss from externality = (1/2) x (MSC - MPC) x (Market output - Efficient output)

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Market Failure Analysis

To understand Market failure, we need to first understand welfare economics. An Italian economist, Vilfredo Pareto stated that allocation of resources in an efficient manner such that an economic change, which harms no one and makes someone better off, indicates an increase in social welfare. It is also called Pareto Optimality, where resources cannot further be reallocated without harming one. This does not apply to those economic changes, which harm some and benefit others. social welfare increases if the utility of any of its members' increases and none decrease in the economy.