According to the rule of rational choice, an individual will undertake an activity as long as:
a. the expected marginal benefits are less than the expected marginal costs.
b. the expected marginal benefits are greater than the expected marginal costs.
c. total expected costs exceed total expected benefits

In a floating exchange rate system, an appreciation of the exchange rate could be caused by

a. a cut in taxes. b. a decrease in government spending. c. an increase in the domestic money supply. d. a decrease in the foreign demand for U.S. goods.

The relationship between a change in the price of a complementary good and demand for another complementary good is

A) positive. B) negative. C) inconclusive. D) zero.