Even if the United States had an absolute advantage in both coffee and air traffic control systems, it should still specialize and engage in trade. Why? The reason is the principle of comparative advantage, which says that each country should specialize in the products that it can produce most readily and cheaply and trade those products for goods that foreign countries can produce most readily and cheaply. This specialization ensures greater product availability and lower prices.

Many countries depend more on international commerce than the United States does. For example, France, Great Britain, and Germany all derive more than 55 percent of their gross domestic product (GDP) from world trade, compared to about 28 percent for the United States.5

The political climate of a country is another critical factor for managers to consider in day-to-day business operations. The amount of government activity, the types of laws it passes, and the general political stability of a government are three components of political climate.