If the marginal propensity to consume is .9, then the marginal propensity to save must be:

The main difference between the price-quantity graph of a perfectly competitive firm and a monopoly is

A) that the competitive firm's demand curve is horizontal, while that of the monopoly is downward sloping. B) that a monopoly always earns an economic profit while a competitive company always earns only normal profit. C) that a monopoly maximizes its profit when marginal revenue is greater than marginal cost. D) that a monopoly does not incur increasing marginal cost.

Public choice theory focuses on the economics of:

A. fiscal and monetary policy. B. the behavior of business firms. C. antitrust and regulatory policy. D. government decision making, politics, and elections.