Before 1995, trade between the United States and Mexico was subject to tariffs. In 1995, Mexico joined NAFTA and all U.S. and Mexican tariffs have gradually been removed. 19. Explain how the price that U.S. consumers pay for goods from Mexico and the quantity of U.S. imports from Mexico have changed. Who are the winners and who are the losers from this free trade? 20. Explain how the quantity of U.S. exports to Mexico and the U.S. government's tariff revenue from trade with Mexico have changed. 21. Suppose that this year tomato growers in Florida lobby the U.S. government to impose an import quota on Mexican tomatoes. Explain who in the United States would gain and who would lose from such a quota.