When used by economists speaking of aggregate demand, "investment"
means money that
A. people put in the stock market or a bank account.
B. firms spend on new machinery and factories, money that families spend on
new houses, and the additions firms make to inventories .
C. families spend on new cars and old houses.
D. pension fund managers put away in interest-bearing bonds and
dividend-paying stocks.
E. none of the abov