Which of the following goods is the best example of a natural monopoly?

During the Great Depression of the 1930s, unemployment peaked at _____%

a. 5 percent b. 10 percent c. 20 percent d. 25 percent e. 30 percent

An example of "cream skimming" is when:

a. a firm charges the same price to all consumers, even though costs for some are higher b. a firm offers a reduced price to the best-paying customers of their competitors c. a firm offers a reduction in price on a package sale of two items d. none of these