____ is a doctrine that holds that exports are good for a country, whereas imports are harmful.

The federal income tax is an example of a

a. progressive tax. b. regressive tax. c. proportional tax. d. value-added tax.

There are outputs for which ________ costs exceed ________ costs in the short run.

A) total fixed; total B) average variable; average total C) total variable; total D) average total; average variable