SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSE ECONOMETRIQUE ETC. 653 
done by taking the number of sectors as running no longer 
from 1 to a fixed (»- 1), but from 1 to let us say x(¢), where 
x(t) denotes a number which increases as an effect of techn- 
cal progress. Thus condition (V.11) must be written: 
'V.12) 
1-3) a, (1-6) e (rie | 
on) App (1-0) a; (1-0) é (rise) Bz az, Ble, 
All this means that the effects of technical progress on the ef- 
fective demand condition are twofold. On the one hand, it 
brings about an average decrease through time of the a,a;,’s 
referring to the commodities so far produced, and on the other 
it keeps on adding new coefficients (referring to new commodi- 
ties). The second tendency may succeed in counter-balancing 
the first. 
However, if this counter-balance still does not come about, 
there is a second way in which condition (V.12) may be kept 
satisfied in time. That is through a long-run diminishing trend 
of the right hand side of the equation; namely of the coefficients 
x and 3. This means a decreasing trend of the working time 
(i.e. an increasing trend of leisure time), to be achieved by a 
decrease either of the proportion of active to total population 
or of the length of the working week. 
All these conclusions may seem, after all, to boil down to 
the common-sense proposition that technical progress gives so- 
ciety a choice between producing more or new goods, and 
enjoying more leisure. Our analytical formulation, however, 
just because of its macro-economic implications, reveals so- 
mething more than that; it evinces the fixed framework within 
which the choice has to be made. It shows that there is a third 
slement in the problem — the requirement of keeping full 
employment — which restricts the choice to those combinations 
‘10] Pasinetti - pag. 83