The relationship between inputs used by a firm and output produced is given by the cost function

Other things equal, the level of bilateral trade between two countries will increase as their GDP:

a. rises. b. falls. c. stays the same. d. becomes less equal.

If the HHI for the widget industry is 1,200, then the market structure is

A) a monopoly. B) monopolistic competition. C) an oligopoly. D) perfect competition. E) impossible to determine