An island has two reefs

| August 30, 2017

Question
An island has two reefs that are suitable for fishing, and there are twenty fishers who simultaneously and independently choose at which of the two reefs (1 or 2) to fish. Each fisher can fish at only one reef. The total number of fish harvested at a single reef depends on the number of fishers who choose to fish there. The total catch is equally divided between the fishers at the reef. At reef 1, the total harvest is given by f1(r1)=8r1-r^2/2, where r1 is the number of fishers who select reef 1. For reef 2, the total catch is f2(r2)=4r2, where r2 is the number of fishers who choose reef 2. Assume that each fisher wants to maximize the number of fish that he or she catches.

a. Find the Nash equilibrium of this game. In equilibrium, what is the total number of fish caught?

b. The chief of the island asks his economics advisor whether this arrangement is efficient, what is the answer? What is the efficient number of fishers at each reef?

c. The chief decides to require a fishing license for reef 1 which would require each fisher who fishes there to pay the chief x fish. Find the Nash equilibrium of the resulting location choice game between the fishers. IS there a value of x such that the equilibrium choices of the fishers results in an efficient outcome? If so, what is this value of x?

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