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18) The United States became a net debtor because A) it ran consistently large current account deficits. B) it ran consistently large current account surpluses. C) it lent a lot to people in foreign countries. D) it provided much foreign aid to other countries. 19) The desired level of the capital stock will increase if the A) user cost of capital increases. B) expected future marginal product of capital increases. C) effective tax rate increases. D) price of capital increases. 20) A temporary supply shock, such as a one month decrease in oil prices, would A) increase the marginal product of capital and increase desired investment, increasing the real interest rate in equilibrium. B) decrease the marginal product of capital and decrease desired investment, decreasing the real interest rate in equilibrium. C) have little or no effect on desired investment, thus not changing the real interest rate by much in equilibrium. D) increase both the marginal product of capital and the marginal product of labor in the long-term future, thus raising the real interest rate in equilibrium