Please consider the case of oligopoly. a. Are there actually such firms in the U.S. economy? What is their relative importance compared to other types of markets? (Absolutely no need to do research on the Internet; some casual observations will be adequate). b. How does the oligopolistic firm decide how much to produce (a graph would help!)? c. How does the oligopolist differ in actions from other types of firms in different types of markets—e.g., as compared to monopoly, monopolistic competition, perfect competition? d. Will oligopolists make a profit always, sometimes, or never? Explain your reasoning.