For barter to occur there must be no markets for people to exchange goods. a double coincidence of wants for each good to be exchanged. services in exchange for goods one person who pays cash. QUESTION 17 Gross public debt is all federal government debt irrespective of who owns it. a situation in which the govemments spending is exactly equal to the total taxes and other revenues it collects during a given time period. an excess of government spending over govemment revenues during a given time period. the total value of budget deficits plus budgot surpluses over the past five years. QUESTION 18 In economics, money is whatever the government defines it to be. anyching that poople generally accept in exchange for goods and services. another term for income. a financial instrument backed by some precious metal such as gold or siver. QUESTION 19 In the Keynesian model, consumption and saving are positively related to income. is positively related to the interest rate but negatively related to a temporary change in income. and saving are nogatively related to the real interest rate. is positively related to income but saving is not systemascally related to either income or interest rates. QUESTION 20 John Maynard Keynes developed his economic theories in the 19305. 18905. 19005. 19905