Approximately how many commercial banks are now operating in the United States?

Entry and exit continue in monopolistic competition until the remaining firms are

A) earning an economic profit. B) incurring an economic loss. C) earning less than a normal profit. D) earning zero economic profit. E) producing the normal amount of product differentiation.

Refer to Table 2-19. What is Wilma's opportunity cost of making a bench?

A) 3 statues B) 1/2 of a bench C) 1.3 statues D) 1/3 of a statue