Zero Sum game and Specialization
The Zero Sum Game

Adam Smith believed in economic freedom.
According to his theory, the government should not care about who trades with whom. Producers, and all consumers, should be free to make their own decisions. If consumers decide to buy from a certain company rather than another, then the other company would be better to specialize in something else. The governments at the time of Adam Smith believed only a certain amount of wealth was available in the world, like poker, when players only bring a certain amount of money to the table. It is a zero sum game. If I win, you lose, and vice versa. According to Smith and other economists, that is not how the world works. Rather, when the nations and corporations of the world begin to trade with each other, the result is a gain for everyone.