Advantages from inventions, or from local situation, climate, etc., slip rapidly from hands of producers, and go to enlarge enjoyments of consumers, 333, 334. Same thing holds of disadvantages, 334. Condillac quoted, 114, 107. Considérant, M., his work on Socialism quoted, 62, note. His opinions on landed property, 257-260. Consumer, every man may in turn be both producer and consumer, 324, 325. The wishes and desires of consumers are those which are in harmony with the public interest, 325. Consumers and producers should be left free to take care of their own interests, 326. The effect of inventions and discoveries on the interests of consumers and producers represented by diagrams, 331, 332. Advantages from inventions, or from local situation, climate, etc., slip rapidly from the hands of producers, and go to enlarge the enjoyments of consumers, 333, 334. Same thing holds of disadvantages, 334. All great economic effects must be regarded from the consumer's point of view, ib. Subordination of producer's interests to those of consumer confirmed when viewed in connexion with morals, 335. Consumer is alone responsible for morality or utility of production, 338. Producer looks only to value, ib. Consumer represents society, ib. Consumption, a term employed to designate the enjoyment to which utility gives rise, 323. General prosperity is measured by consumption, and not by labour, 325. Consumption the great end of Political Economy, 338. Coudroy, Felix, studies Philosophy and Political Economy along with Bastiat, 10. Letter to, quoted, 15. Another letter to, quoted, 26. D. Defoe, D., his Robinson Crusoe referred to, 101. Illustration drawn from, 197. Demand determines all in connexion with production, 335. Diamond, has great value without appreciable utility, 139. Value of one found accidentally and exchanged arises, not from the effort of the person who renders the service, but the effort saved to the one who receives it, 141, 142. This a new principle not to be found in the works of economists, 141. Disturbing Causes. Political Economy sets out by assuming transactions to be free and voluntary, 446. Liberty is harmony, 447. Economists not optimists, 448, 449. Errors of judgment one disturbing cause, 452, 453. Division of Labour admits of being viewed in a more general light than hitherto, 105. Dunoyer, M., his work Sur la Liberté du Travail referred to and commended, 92. E. Economists differ from the Socialists at the starting-point, 35, 36. Efforts. Wants, efforts, and satisfactions, 63-74. Effort saved to the person who receives a service imparts value to the service rendered, 141, 142. England, population of, doubles in 43 years, 404.