Which of the following is a public good?

When the U.S. Treasury sells gold, the immediate effect is that __________ and __________

A) reserves increase; currency in circulation decreases B) reserves decrease; currency in circulation increases C) reserves increase; Treasury deposits decrease D) reserves decrease; Treasury deposits increase

During the 1900-1950 period,

a. the growth of real GDP was more stable than has been the case since 1950. b. unemployment seldom exceeded 4 percent of the labor force. c. double-digit swings in real GDP during a single year were not uncommon. d. the money supply was increased at a constant annual rate of between 4 percent and 6 percent throughout the period.