"Liquidity" refers to the ability to change money into assets

Which of the following statements is true?

A) The marginal cost curve intersects the average fixed cost curve at its minimum point. B) When marginal cost is greater than average fixed cost, average fixed cost increases. C) Average fixed cost does not change as output increases. D) As output increases, average fixed cost becomes smaller and smaller.

Firms faced with prisoners' dilemma can always make more profits by engaging in opportunistic behavior. Why is this type of behavior NOT commonly found even in oligopolistic markets?

What will be an ideal response?