The Theory of Money and Credit - Ludwig von Mises [76]
of the commodities would largely cancel one another out, and consequently, that such calculations would make it possible to discover the direction and extent of the effects of those determinants of price movements that lie on the monetary side. This assumption would prove correct, and the inquiries instituted with its help could led to the desired results, if the exchange ratios between the other economic goods were constant among themselves. Since this assumption does not hold good, refuge must be taken in all sorts of artificial hypotheses in order to obtain at least some sort of an idea of the significance of the results gained. But to do this is to abandon the safe ground of statistics and enter into a territory in which, in the absence of any reliable guidance (such as could be provided only by a complete understanding of all the laws governing the value of money), we must necessarily go astray. So long as the determinants of the objective exchange value of money are not satisfactorily elucidated in some other way, the sole possible reliable guide through the tangle of statistical material is lacking. But even if investigation into the determinants of prices and their fluctuations, and the separation Of these determinants into single factors, could be achieved with complete precision, statistical investigation of prices would still be thrown on its own resources at the very point where it most needs support. That is to say, in monetary theory, as in every other branch of economic investigation, it will never be possible to determine the quantitative importance of the separate factors. Examination of the influence exerted by the separate determinants of prices will never reach the stage of being able to undertake numerical imputation among the different factors. All determinants of prices have their effect only through the medium of the subjective estimates of individuals; and the extent to which any given factor influences these subjective estimates can never be predicted. Consequently, the evaluation of the results of statistical investigations into prices, even if they could be supported by established theoretical conclusions, would still remain largely dependent on the rough estimates of the investigator, a circumstance that is apt to reduce their value considerably. Under certain conditions, index numbers may do very useful service as an aid to investigation into the history and statistics of prices; for the extension of the theory of the nature and value of money they are unfortunately not very important.
4 Wieser's Refinement of the Methods of Calculating Index Numbers
Very recently Wieser has made a new suggestion which constitutes an improvement of the budgetary method of calculating index numbers, notably employed by Falkner. [3] This is based on the view that when nominal wages change but continue to represent the same real wages, then the value of money has changed, because it expresses the same real quantity of value differently from before, or because the ratio of the monetary unit to the unit of real value has changed. On the other hand, the value of money is regarded as unchanged when nominal wages go up or down, but real wages move exactly parallel with them. If the contrast between money income and real income is substituted for that between nominal and real wages and the whole sum of the individuals in the community substituted for the single individual, then it is said to follow that such variations of the total money income as are accompanied by corresponding variations of the total real income do not indicate variations in the value of money at all, even if at the same time the prices of goods have changed in accordance with the altered conditions of supply. Only when the same real income is expressed by a different money income has the specific value of money changed. Thus to measure the value of money, a number of typical kinds of income should be chosen and the real expenditure corresponding to each determined, that is, the quantity of each kind of thing on which the incomes are spent. The