Recessions occur at irregular intervals and are almost impossible to predict with much accuracy

The marginal physical product of labor is not

a. the change in output that results from employing an additional worker b. the average productivity of each worker employed c. the marginal contribution to output of each additional worker d. a measure of the contribution of an additional worker to output e. usually increasing at an increasing rate for the first units of labor used in production

In the CPI, goods and services are weighted according to

a. how long a market has existed for each good or service. b. the extent to which each good or service is regarded by the government as a necessity. c. how much consumers buy of each good or service. d. the number of firms that produce and sell each good or service.