Consider a portfolio with three stocks, each with the same value. The three stocks have standard deviations of 20%, 40%, and 90%. The standard deviation of this portfolio is

Keynesian economists argue that monetary policy works through its effects on:

a. interest rates and investment. b. price- and wage-flexibility. c. budget deficits and trade deficits. d. the spending and money multipliers.

Using the expenditure approach to GDP accounting, which of the following are included in the investment category?

a. the purchase of government bonds b. the purchase of corporate bonds c. the purchase of corporate stocks d. none of the above