Which of the following workers would be most likely to work fewer hours as a result of a wage increase?

If the marginal social cost of generating a kilowatt of electricity is $0.10 and the marginal private cost is $0.08, what is the marginal external cost?

A) $0.18 B) $0.10 C) $0.08 D) $0.02 E) $0.80

Which of the following would not shift the demand curve for mp3 players?

a. a decrease in the price of mp3 players b. a fad that makes mp3 players more popular among 12-25 year olds c. an increase in the price of digital music downloads, a complement for mp3 players d. a decrease in the price of satellite radio, a substitute for mp3 players