The market supply and demand functions for a good traded on a perfectly competitive market are:
Qd = 75 - 1.5P and Qs = 21 + 0.5P
(i) What is the equilibrium price and quantity on this market?
(ii) If the consumption of each unit of this good gives rise to a social cost of $4, what is the socially optimal equilibrium quantity and price? Assume that consumers pay a tax of $4 per unit.
(iii) If the consumption of each unit of this good gives rise to a social benefit of $8, what is the socially optimal equilibrium quantity and price? Assume that consumers receive a subsidy of $8 per unit.

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The Answer of The market supply and demand functions for a good traded on a perfectly competitive market are:
Qd = 75 - 1.5P and Qs = 21 + 0.5P
(i) What is the equilibrium price and quantity on this market?
(ii) If the consumption of each unit of this good gives rise to a social cost of $4, what is the socially optimal equilibrium quantity and price? Assume that consumers pay a tax of $4 per unit.
(iii) If the consumption of each unit of this good gives rise to a social benefit of $8, what is the socially optimal equilibrium quantity and price? Assume that consumers receive a subsidy of $8 per unit.

The Market Supply and Demand Functions for a Good Traded