Every choice involves giving up an opportunity to produce or consume something else.

The principal innovation that increases the safety of bank deposits is

a. computerized accounting systems. b. credit cards. c. automatic teller machines. d. deposit insurance.

In the early 1920s,

a. Germany experienced a very high rate of inflation. b. the quantity of German money was declining rapidly. c. the value of German money remained almost constant. d. All of the above are correct.