Adam Smith's key insight was that both parties to an exchange can benefit and that, so long as cooperation is strictly voluntary, no exchange can take place unless both parties do benefit.
Milton FriedmanHistory suggests that capitalism is a necessary condition for political freedom. Clearly it is not a sufficient condition.
Milton FriedmanThe only reason free markets have a ghost of a chance is that they are so much more efficient than any other form of organization.
Milton FriedmanIf China don't free up the political side, its economic growth will come to an end - while it is still at a very low level.
Milton Friedman