Sometimes, government contributes to allocative inefficiency. Under current U.S. law, ethanol intended for use as vehicle fuel must be made from corn. Part of this law imposes a tariff of $0.54 on every gallon of ethanol imported into the U.S. This tariff is aimed squarely at Brazil, which produces ethanol from cane sugar at about 20 percent of the cost of producing ethanol from corn. Technologically, producing ethanol from sugar needs only water and yeast, while corn needs to be cooked before fermentation. The result has been high corn prices leading to high prices of many other foods, such as beef and chicken, because those animals feed on corn. Producing ethanol from sugar in the U.S. is economically unattractive because the government restricts sugar imports. The price of sugar in the U.S. is about twice the world price due to these import restrictions. While the U.S. economy may be productively efficient, it is not allocatively efficient, largely because of these policies. In fact, the ongoing example of increasing opportunity cost as the quantity of corn increases fits this example perfectly. Question: Why does the government impose tariffs on ethanol and sugar imports?