A competitive employer should hire additional labor as long as:

Increasing marginal returns to labor might occur at low levels of labor input because of

A) increasing average costs. B) differing factor proportions. C) increasing specialization of tasks. D) decreasing use of machinery and increasing use of technology.

In 2007, at the federal level government purchases of goods and services putting transfer payments and interest aside, amounted to approximately what percentage of GDP?

a. 5 percent b. 15 percent c. 25 percent d. 30 percent e. 50 percent