d. The concept of \"invisible-hand\" in economics is best explained by the following quote: \"It is not from the benevolence of the butcher; the brewer, or the baker; that we expect our dinner; but from their regard to their own interest. We address ourselves, not to their humanity but to their self-love, and never talk to them of our necessities but of their advantages.\" (Adam Smith, the Wealth Of Nations, Book IV, Chapter II, p. 456, para. 9.)