The attachment of the question is included below

(11pts) In each period, two firms, A and B, simultaneously decide whether to restrict output or not. The payoff for each outcome is as follows: . Both firms restrict output: each gets 45 . One firm restricts output, and the other does not: the former gets 15, the latter gets 60 . Neither firm restricts output: each gets 20 Suppose that the two firms play a repeated game. There is some uncertainty about whether the game will continue next period or not. If the game ends, then each firm receives payoff of zero forever. Each period, the probability that the game will continue next period is equal to p. What is the condition on p for which both firms playing the grim trigger strategy is a Nash equilibrium? Assume that firms do not discount future payoffs and that they are risk neutral