What percent of the world's nations have at least five significant ethnic populations?

If Ben becomes less likely to buy smoke detectors after he has fire insurance, he is illustrating

A) moral hazard. B) adverse selection. C) the lemon problem. D) the free rider problem.

If the required reserve ratio is 0.05 and the Fed sells a $2,000 bond directly to an individual who pays for it with a check, what will happen to the money supply?

a. The money supply will increase by $2,000. b. The money supply will decrease by $2,000. c. The money supply will increase by $100. d. The money supply will decrease by $100. e. The money supply will decrease by $200.