________ uses the concept of marginal analysis to determine the optimum choice

Which of the following lists has variables that all shift a good's demand curve?

A) price of the good, preferences, prices of substitution goods, income B) income, preferences, number of buyers, price of complementary good C) expectation of future price, price of the good, number of buyers, income D) Both answers A and B are correct.

When government imposes price controls in a market,

a. non-price factors become more important in the rationing of the good. b. efficiency in the market is enhanced. c. shortages and surpluses are eliminated. d. buyers and sellers both become better off.