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See: "Invisible Hand"

In economics, the invisible hand, also known as invisible hand of the market, is the term economists use to describe the self-regulating nature of the marketplace. This is a metaphor first coined by the economist Adam Smith in The Theory of Moral Sentiments... For Smith, the invisible hand was created by the conjunction of the forces of self-interest, competition, and supply and demand, which he noted as being capable of allocating resources in society.

http://en.wikipedia.org/wiki/Invisible_hand