A tax imposed by a government on imported goods or services is a:

In the long run, which of the following will occur if the U.S. federal government eliminates restrictions on migration of Mexican workers to the United States?

a. The United States' total K/L ratio will rise. b. Mexico's total K/L ratio will fall. c. Wages of American workers who compete with Mexican workers for jobs will rise. d. The returns to U.S. owners of capital will remain unchanged.

If the marginal external cost of building a children's playground equals zero, then the i. marginal private cost equals the marginal social cost. ii. marginal social cost equals zero. iii. marginal private cost equals zero

A) i only B) ii only C) iii only D) ii and iii E) i and ii