The above table shows the marginal benefits and costs from production of fertilizer. There are no external benefits. The efficient level of output is

Marginal utility is

A. the difference in price between one store and another. B. the difference in value between “some” of a thing and “none” of a thing. C. the difference between any two successive total utility figures. D. acquired only with the first few units of a good or service. E. utility that is barely satisfactory.

Because marginal cost is always ________ in the short run, total variable cost always ________ when output increases.

A. positive; decreases B. negative; increases C. negative; decreases D. positive; increases