If marginal revenue equals marginal cost in the short run, the perfectly competitive firm earns zero profits

Countries where investment is

A) relatively unproductive should have current account deficits. B) relatively productive should have current account surpluses. C) relatively productive should have current account deficits. D) relatively productive should have balanced current accounts. E) relatively unproductive should have balanced current accounts.

Some economists feel we should encourage market concentration because they believe monopolists and oligopolists can

a. c and d b. c, d, and e c. become technically superior d. achieve economies of scale e. innovate