In national income terms, aggregate demand is the

a. Demand for money by the community in a period of full employment.

b. Total expenditure on capital goods by entrepreneurs during a period of full employment.

c. Demand that is needed if a country’s economy is to operate at optimum level and the level of investment is to be raised.

d. Total expenditures on consumer goods and investment, including government and foreign expenditures, during a given period.