13. Suppose x = 1. Then it must be true that (A) Harry and Jake have the same income, which is lower than Darby's income. (B) if sandwiches and potato chips are complements for Harry, then those two goods are also complements for Jake. (C) Harry's demand curve is identical to Jake's demand curve. (D) All of the above are correct.

18. A study sponsored by the Food Consumer Safety Board found that consumption of irradiated tomatoes increased the health of laboratory rats. As a result of national press coverage of the report, the demand for irradiated tomatoes increased dramatically. Organic farmers were able to switch from organic production of tomatoes to irradiated production with no additional cost. Assume that the tomato market satisfies all of the assumptions of perfect competition. As a result of the increase in the demand for tomatoes, we would predict that in the short run that the (A) production of tomatoes would be at efficient scale. (B) price of tomatoes would rise. (C) total cost for existing irradiated tomato producers must rise. (D) number of firms in the market would fall as prices fall and firms exit the market.

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