Refer to the above figure. Which panel is consistent with the Laffer curve?

Excessive volatility refers to the fact that

A) stock returns display mean reversion. B) stock prices can be slow to react to new information. C) stock price tend to rise in the month of January. D) stock prices fluctuate more than is justified by dividend fluctuations.

Suppose that the firm's only variable input is labor. When 50 workers are used, the average product of labor is 50 and the marginal product of labor is 75. The wage rate is $80 and the total cost of the fixed input is $500. What is average total cost?

A. $1.80 B. $0.825 C. $0.63 D. $4.10 E. none of the above