In an economy that relies on barter, trade requires a double-coincidence of wants

In a monopolistically competitive industry

A) firms can make an economic profit in the long run because of barriers to entry. B) the firms can never make an economic profit. C) if firms are making an economic profit, new firms enter the industry. D) firms can make an economic profit in the long run because of product differentiation.

Which antitrust law is sometimes called the "Chain Store Act"?

A) Sherman Act B) Clayton Act C) Robinson-Patman Act D) Federal Trade Act