After quoting the (in)famous paragraph from Wealth Of Nations (WN IV.ii.9: 456), chapter 3 continues:“The Invisible Hand and Perfect Competition”“Smith proclaimed the principle of the ‘invisible hand’. It says that every individual, in selfishly pursuing only his or her personal good, is led, as if by an invisible hand, to achieve the best good for all. In this best of all possible worlds, any interference with free competition is certain to be injurious.” (p 41) - http://adamsmithslostlegacy.blogspot.com/search?q=samuelson+invisible+hand