The marginal utility theory is ordinarily merely a thinly disguised version of supply and demand doctrine. As usually presented in the text-books, we have an analysis of the phenomenon of diminishing utility of a given commodity to a given individual, illustrated by a diagram, in which the ordinates represent diminishing psychological intensities. Often a money measure is given to these diminishing intensities, and the curve is presented as the demand schedule of a given individual. Then, with little further analysis, a leap is made to the market, and it is assumed that the market demand-curve, of many individuals, differing in wealth and character, is a utility-curve, and value in the market is "explained" by means of marginal utility. I need not here repeat my criticisms of this procedure.[62] It gives simply a confused statement of the doctrine of supply and demand. The analysis of utility which precedes the discussion of market demand is wholly irrelevant, and merely mixes things up. That such a conception is of no use in solving the problem of the value of money has been sufficiently indicated in the chapter on supply and demand. Sometimes the contention is made that money is unique among goods in having "no power to satisfy human wants except a power _to purchase_ things which do have such power."[63] This contention, in Professor Fisher's view, precludes the application of the marginal utility theory to the problem of the value of money, and he makes no use of marginal utility in his explanation. Indeed, in the passage from which this quotation is taken, Professor Fisher says that the quantity theory of money rests on just this peculiarity of money. Not all writers who contend that money has no utility _per se_, however, have felt it necessary to give up the marginal utility theory as a theory of money, as we shall later see.