Master College Concepts with Expert Q&A and Solutions

Functions of money and barterConsider an economy in which money does not exist, so that agents rely on barter to carry out transactions. When the economy was small, barter seemed sufficient. However, the economy has now begun to grow.If people in this economy trade three goods, the price tag of each good must list ______________?prices, and the economy requires____________?prices for people to carry out transactions.Suppose that the number of goods people trade increases to 15. Then the price tag of each good must list _________?prices, and the number of prices that the economy requires increases to____________?Now suppose that our economy has a money. The government now issues a national currency and there is no longer any barter.In this economy, money and currency are not the same because:1. The fact that the government issues currency means that the currency will be accepted as money by all agents.2. The fact that the currency is backed by the government means that it will never lose value and will remain a perfect unit of account.3. Just because the government issues currency does not mean that the currency will be accepted as money, since it must be used as a medium of exchange, store of value and standard of value.4. Just because the government issues currency does not mean that the currency will be accepted as money, and buyers and sellers still need barter to ensure that money does not lose its value.Suppose now that our economy is suffering from rapid, ongoing increases in the cost of living. Which characteristic of money is directly negatively impacted in that economy?1. Medium of exchange2. Double coincidence of wants3. Store of value4. Unit of account
Annual U.S. imports from a certain country in the years 1996 through 2003 can be approximated by I(t) = t^2 + 3.7t + 50 (1 leq t leq 9) billion dollars, where t represents time in years since 1995. Annual U.S. exports to this country in the same years can be approximated by E(t) = 0.3t^2-1.4t + 16 (0 leq t leq 10) billion dollars. Assuming the trends shown in the above models continue indefinitely, numerically estimate the following. (If you need to use infinite or -infinite, enter INFINITY or -INFINITY, respectively. If an answer does not exist, enter DNE.) lim t tends to +infinite and lim t tends to +infinite E(t)/I(t) lim t tends to +infinite E(t)= lim t tends to +infinite E(t)/I(t)= Interpret your answers. A. In the long term, U.S. exports to the country will fall without bound and be 0.3 times U.S. imports from the country. B. In the long term, U.S. exports to the country will rise without bound and be 0.3 times U.S. imports from the country. C. In the long term, U.S. imports from the country will rise without bound and be 0.3 times U.S. exports to the country. D. In the long term, U.S. imports from the country will fall without bound and be 0.3 times U.S. exports to the country. Comment on the results. A. In the real world, imports and exports can rise without bound. Thus, the given models can be extrapolated far into the future. B. In the real world, imports and exports can fall without bound. Thus, the given models can be extrapolated far into the future. C. In the real world, imports and exports do not change, they always stay fixed. Thus, the given models should not be extrapolated far into the future. D. In the real world, imports and exports cannot rise without bound. Thus, the given models should not be extrapolated far into the future.