The following are the Production possibility frontier of the U.S. and Germany. Draw the PPF for two countries with airplanes on the vertical axis. What is the opportunity cost of each additional airplanes (in terms of cars) in the U.S.? (For this, first think about how many cars they should give up to get 2 additional airplanes. And then, divide that number by 2 to see how many cars they should give up to get 1 additional airplanes). In Germany? Which country has comparative advantage in airplane production? In car production? Show that, if each country specializes according to the principle of comparative advantage, and trade at the terms of trade of 1 airplane = 1 car, then each country is better off. You are supposed to show a point with specific numbers outside the PPF