A company can hire non-union workers, but a condition of their employment is that they must join the union within their first 90 days on the job. This is an example of a

The table above lists the market shares of the twenty makers of personal computers. The four-firm concentration equals

A) 5 percent. B) 20 percent. C) 25 percent. D) 100 percent.

The progressive income tax is an automatic stabilizer with respect to the Federal government's budget surplus or deficit because

A) individuals must "automatically" pay taxes even when they have a deficit. B) during periods of output growth, a greater percentage of real income "leaks" from the expenditure stream. C) during periods of output growth, the marginal leakage rate increases as taxes decrease. D) None of the above.