A possible explanation for a natural phenomenon is called

The firms in an oligopoly market structure agree to collude because:

a. it helps them to earn more profits. b. each firm wants to know the strategy of its rivals. c. each firm wants to charge a lower price for its product than its rivals. d. the firms want to maintain a healthy relationship with each other. e. it helps them to enjoy economies of scale.

On a bowed production possibilities frontier, as you move down along the curve

a. more of one good must be given up to receive one unit of the other good. b. the available production technology does not change. c. the opportunity cost increases. d. All of the above are correct.