Oligopoly differs from perfect competition and monopolistic competition in that
A) demand and marginal revenue curves are more useful for analyzing oligopoly than they are for analyzing perfect competition and monopolistic competition.
B) the concentration ratios of oligopoly industries are lower than they are for perfectly competitive and monopolistically competitive industries.
C) barriers to entry are lower in oligopoly industries than they are in perfectly competitive and monopolistically competitive industries.
D) because oligopoly firms often react when other firms in their industry change their prices, it is difficult to know what the oligopolist's demand curve looks like.
D
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The payoff matrix below shows the payoffs (in millions of dollars) for two firms, A and B, for two different strategies, investing in new capital or not investing in new capital. 
An industry spy comes to firm B and claims to know what firm A has decided. Given that each firm already knows the payoff matrix, how much would this information be worth to firm B?
A. $0. B. $50 million. C. $70 million. D. $30 million.
Suppose that a bond promises to pay its holder $100 a year forever. If the price of the bond increases from $1,000 to $1,250, then the interest rate on the bond
A) falls from 10 percent to 8 percent. B) rises from 8 percent to 10 percent. C) does not change because it is not affected by the price of the bond. D) falls from 10 percent to 6 percent.
A monopolist maximizes profits by finding
A) the rate of output where marginal revenue equals marginal cost. B) the rate of output where price equals marginal cost. C) the price where price exceeds marginal revenue by that largest amount. D) the price where average revenue and marginal cost are equal.
The purchases and sales of international reserve assets such as dollars, foreign exchanges, gold, and special drawing rights (SDRs) by a nation's central bank is recorded in the _____
a. current account b. capital account c. official reserve account d. savings account