Newfoundland's fishing industry has recently declined sharply due to overfishing, even though fishing companies were supposedly bound by a quota agreement. If all fishermen had abided by the agreement, yields could have been maintained at high levels.

a. Model this situation as a prisoner's dilemma in which the players are Company A and Company B and the strategies are to keep the quota and break the quota. Include appropriate payoffs in the matrix. Explain why overfishing is inevitable in the absence of effective enforcement of the quota agreement.

b. Provide another environmental example of a prisoner's dilemma.

c. In many potential prisoner's dilemmas, a way out of the dilemma for a would-be cooperator is to make reliable character judgments about the trustworthiness of potential partners. Explain why this solution is not available in many situations involving degradation of the environment.