The growth function for fish stocks is x = −S2 + 10S. S is the fish resource stock, while x is the resource growth amount in tons. Furthermore, the price for fish resources is ¥1/ton. The total cost (TC) of fishing is TC = 20 − 2s. Keeping the above in mind:

a. Determine the maximum sustainable yield (MSY).

b. Determine the fish resource stock if open access fishing occurs in this fishery.

c. Determine the fish resource stock if the fishing industry profits are maximized.