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.

U.S. managers must develop a global vision if they are to recognize and react to international business opportunities, as well as remain competitive at home. Often a U.S. firm’s toughest domestic competition comes from foreign companies. Moreover, a global vision enables a manager to understand that customer and distribution networks operate worldwide, blurring geographic and political barriers and making them increasingly irrelevant to business decisions. Over the past three decades, world trade has climbed from $200 billion a year to more than $1.4 trillion.1 U.S. companies play a major role in this growth in world trade, with 113 of the Fortune 500 companies making over 50 percent of their profits outside the United States.