As a consumer buys more of a good, total utility eventually becomes negative

Economists distinguish a "normal" good from an "inferior" good by focusing on

A) how a change in income effects the demand for that good. B) the good's quality. C) the good's durability. D) the good's desirability. E) all of the above.

The monopolistic competitive firm in short-run equilibrium may experience economic profits that are

A) always zero. B) greater than, equal to, or less than zero. C) always positive. D) always negative.