Consider 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:The fact that the government issues currency means that the currency will be accepted as money by all agents.