Refer to Table 18.1. The opportunity cost of a glove in Russia is

When a firm experiences constant returns to scale,

a. long-run average total cost is unchanged, even when output increases. b. long-run marginal cost is greater than long-run average total cost. c. long-run marginal cost is less than long-run average total cost. d. the firm is likely to experience coordination problems.

In which of the following markets are strategic interactions among firms most likely to occur?

a. markets to which patent and copyright laws apply b. the market for piano lessons c. the market for tennis balls d. the market for corn