Much of the demand for U.S. agricultural output has come from other countries. In 1998, the total demand for wheat was Q T = 3244 - 283 P . Of this, domestic demand was Q D = 1700 - 107 P . Domestic supply was Q S = 1944 + 207 P . Suppose the export demand for wheat falls by 40 percent.(提示:出口需求 Q E 下降40%,则新的出口需求函数为0.6 Q E ) a. U.S. farmers are concerned about this drop in export demand. What happens to the free market price of wheat in the United States? Do the farmers have much reason to worry? b. Now suppose the U.S. government wants to buy enough wheat each year to raise the price to $3.50 per bushel. With this drop in export demand, how much wheat would the government have to buy? How much would this cost the government?