What typically happens to imports as income and spending rise?

What is the function of the system of federal regulation created by Congress from 1887 until now?

(a) To change the outcomes of market decisions (b) To enforce the outcomes of market decisions (c) To replace market allocations with economic planning (d) To enforce the law

A pollution tax is:

a. a positive externality used to offset a negative one b. a price per unit of discharge of pollution c. a tax on pollution control equipment d. itself a form of negative externality