For the simple case of a production function with two inputs in which the inputs are perfect complements, each isoquant is represented by:

Collusion between two firms occurs when

A) announce that each will match its rival's market price. B) firms explicitly or implicitly agree to adopt a uniform business strategy. C) the firms independently pursue strategies that could hurt each other. D) firms act altruistically to bring about the economically efficient outcome.

Which of the following is NOT a major actor in the foreign exchange market?

A) corporations B) central banks C) commercial banks D) non-bank financial institutions E) tourists