“Krugman's whole attack is directed at a statement made neither by Arthur nor by Cassidy. Krugman has not read Cassidy's piece with any care nor has he bothered to review what Arthur has in fact said.”

Pages 153–154.
The Common Sense of Political Economy (1910), Systematic and Constructive (Book I), "Money and Exchange" (ch. 4)
Context: But neither can anything we desire be got without money, or what money represents, i. e. without the command of exchangeable things. All the things that we so often say "cannot be had for money" we might with equal truth say cannot be had or enjoyed without it. Friendship cannot be had for money, but how often do the things that money commands enable us to form and develop our friendships! … But even "waiting" requires money, if not so much as marrying does. In fact, a man can be neither a saint, nor a lover, nor a poet, unless he has comparatively recently had something to eat. The things that money commands are strictly necessary to the realisation on earth of any programme whatsoever. The range of things, then, that money can command in no case secures any of those experiences or states of consciousness which make up the whole body of ultimately desired things, and yet none of the things that we ultimately desire can be had except on the basis of the things that money can command. Hence nothing that we really want can infallibly be secured by things that can be exchanged, but neither can it under any circumstances be enjoyed without them.

Source: Heart of Ice A Triple Threat Novel with April Henry (Thomas Nelson), p. 59

Source: They'd Rather Be Right (1954), pp. 17-18.

Source: The Forge of God (1987), Chapter 24 (p. 159)

Source: The Tales of Alvin Maker, Heartfire (1998), Chapter 14.

History of the Indies (1561)

Source: The Hitchhiker's Guide to the Galaxy

Source: The Original Hitchhiker Radio Scripts

Letter to his publisher, John Murray (3 November 1821).