“only calculation and distribution in terms of market prices make it possible to utilise our discoverable resources intensively, to guide production to serve ends lying beyond the range of the producer’s perception, and to enable the individual to participate usefully in productive exchange (first, by serving people, mostly unknown to him, to the gratification of whose needs he can nonetheless effectively contribute; and second, by himself being supplied as well as he is only because people who know nothing about his existence are induced, also by market signals, to provide for his needs: see the previous chapter).”