2. Repeated games. Two firms must simultaneously choose their prices, setting either PH or PL. Suppose payoffs are given by the values in the table below. Firm 2 PH PL 20 30 PH 20 0 Firm 1 0 15 PL 30 15 (a) Determine the Nash equilibria of the one-shot game. (b) Suppose the game is indefinitely repeated and that the relevant inter- est rate is r = 10%. Determine the optimal symmetric equilibrium