" Economists talk about an invisible hand, in which the self-interested, short-term activities of people lead to what Adam Smith called “the wealth of nations.” Geopolitics applies the concept of the invisible hand to the behavior of nations and other international actors. The pursuit of short-term self-interest by nations and by their leaders leads, if not to the wealth of nations, then at least to predictable behavior and, therefore, the ability to forecast the shape of the future international system. "

― George Friedman , The Next 100 Years: A Forecast for the 21st Century