If the Fed sells a T-bill to a commercial bank, how will this affect the money supply?

When a country forgoes its own currency and starts using another country's currency as its own, we say that this country has

A) created a currency board. B) undergone dollarization. C) adopted a managed exchange system. D) adopted an exchange rate monetary system.

The marginal rate of substitution is the

a. quantity of a good a consumer receives for $1 payment b. income a consumer gives up to acquire one unit of the good c. ratio of the prices of two goods d. rate at which the consumer is willing to trade one good for another good e. relative quantity of a good that two consumers trade