The U.S. economy experienced a significant slowdown in productivity growth that lasted from about 1973 to about __________

The above figure shows that the maximum amount a person is willing to pay for the 400th pretzel

A) is greater than the marginal social cost of the 400th pretzel. B) is less than the marginal social benefit of the 400th pretzel. C) and the marginal social benefit of the 400th pretzel are both $2. D) is greater than the marginal social benefit of the 200th pretzel.

Assume Joe invests a total of $10,000 in a company - $5,000 of which is his own money and $5,000 which he borrowed at a 10% interest rate. If the company's stock value decreases by 5% in one year at which time Joe sells his shares of the stock, what is Joe's rate of return on his investment?

a. ?5% b. ?10% c. ?20% d. ?30%