________ increases economic efficiency because it forces firms to produce and sell goods and services as long as the additional benefit to consumers is greater than the additional cost of production

When a tax is imposed on a good, at the after-tax equilibrium the marginal benefit of the last unit produced ________ the marginal cost

A) equals B) is greater than C) is less than D) can be calculated but is not comparable to E) The premise of the question is incorrect because after a tax is imposed, it becomes impossible to determine the marginal benefit and the marginal cost.

In games with more than three players, the horizontal axis measures

A) the number of players. B) payoffs. C) time. D) all of the above