SEMAINE D'ÉTUDE SUR LE ROLE DE L’ANALYSF ECONOMETRIQUE ETC. 623 
2) all commodity prices — if W is taken as the arbitrarily 
fixed price — decrease in time at the rate p. Alternatively 
— if the price of any commodity instead of W is taken as 
given — all commodity prices remain constant as time 
goes on, while the wage rate increases at the rate p. Another 
way of stating this result is to say that the commodity price 
structure (relative prices of commodities) remains constant 
‘through time, while the real wage rate increases at the rate c; 
3) employment in each sector remains invariant as time goes 
on: 
4) production of each commodity evaluated at current prices 
remains constant in time (if W is taken as the arbitrarily 
fixed price) or increases at the rate p (if any commodity 
price, instead of W, is taken as given); 
5) all sectoral capital-output ratios, as well as the over-all 
capital-output ratio, remain constant. 
3. Analytical properties of the two cases of growth considered 
so far 
The most attractive property of the case of economic growth 
just examined is that it still retains the constancy of the pro- 
portions of the system in time. By the device of uniformity both 
in technical change and in expansion of demand, all movements 
of coefficients cancel out inside each sector and moreover the 
structure of prices remains unchanged. Thus, again, the system 
expands by multiplying all its sections in the same proportion 
so that its relative composition is invariant with respect to 
zrowth and time. 
From an analytical point of view, there is a remarkable 
symmetrical correspondence between the two cases of growth 
~onsidered so far. In the case of population growth the wage 
101 Pasinetti - pag. 53.