SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE Etc. 867 provides a good representation of the function which would be erived empirically, at least as a first approximation. Were it to appear that an exponential expression cannot represent the function adequately, the assumption could be made that the function e"*°¢(6), where p is an appropriate constant, could be developed as a Taylor series and quite well represented by its first terms. This is a relatively weak hypo--hesis, and one which does not appear to be inacceptable. The general properties arising when this hypothesis is postulated are treated in the appendix (" As an illustration, values ot 335-2) 335-3) 31 Ê : (335-4) 335-5) 335-6) X ta pa _ «£ -t Gu (1) The study contained in the appendix considers the function [‘@ ‘rom zero to infinity; but the characteristics at infinity of the functions ‘ ‘6) and ¢(0) need not be taken into account in numerical applications. is therefore possible to consider only a finite range of variation of 0. ‘or example the interval (o, 100). Allais - pag. 171