SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE ETC. 863 Turning now to the overall amortization period for primary income, here this period, given the assumptions made, is equal to 334-32) & -(; ; 8 axon’ A LYR-1(s 3 ÎT | - ¥ whence (334-33) For O=4.23, A=0.316, (!) we find ®=4.05. [his value is of the same order of magnitude as the values © ® and 6, 4.56 and 4.23 respectively, found earlier (-, 11) Of course, the concordance of the orders of magnitude of the different values of the quantities studied in the preceding calculations cannot be considered as proof of the validit~ "te exponential model. The successive hypotheses (1 5 and 374-7 11] Allais - pag. 167