614 
PONTIFICIAE ACADEMIAE SCIENTIARVM SCRIPTA VARIA - 
These corrections do not affect the expressions we found for 
prices — for example the (II.14) — where the technical coef- 
ficients appear, provided that the wage rate is also referred to 
a unit of actual working time. They do affect, on the other 
hand, the expression of the effective demand condition for 
equilibrium. (This is after all intuitive: the conditions for 
reaching full employment are evidently different according to 
the ratio of active to total population and to the length of 
the working week). Hence, after introducing « and B, (III.o) 
becomes 
I I I 
(III. 11) 3 Sawant (gm) LS an, app =1, 
which must be considered as a more complete formulation of 
the effective demand condition for a dynamic equilibrium. 
+. The dynamic movements of relative prices, physical quan- 
hlies and other economic variables 
To find now how prices and physical quantities move as 
time goes by is a very easy task. As to prices, it can imme- 
diately be seen from the (II.14) or from the (II.16) that, under 
the present hypotheses, all their components are constant in 
time, so that all relative prices remain constant as time goes on. 
The expressions found for physical quantities on the other 
hand — the (II.11) or the (II.15) — all contain one compo- 
nent, namely population, which is increasing at a percentage 
rate g. Therefore, each physical quantity increases in time at 
the percentage rate of growth g. 
Besides prices and quantities, there are other magnitudes 
in the system which are of economic interest and which are 
worth considering. The time-paths of two series of them in 
particular — the amounts of employment in each of the sectors 
and the production of each commodity at current prices — can 
[10] Pasinetti - pag. 44