In January 2009, how many members of the Federal Reserve board had been appointed by George Bush?

Negative cross-price elasticity of demand indicates that

a. the product is an inferior good b. the product is a necessity c. the product is a luxury d. the two products are substitutes e. the two products are complements

Alex must prepare for exams in both biology and economics this week. Assume that the production possibilities curve showing the tradeoff between exam scores in biology and economics is concave toward the origin. As Alex moves along the curve spending more of his time studying for economics, the opportunity cost of an hour of preparation for economics: a. increases

b. remains constant. c. decreases. d. first increases then decreases.