SEMAINE D'ÉTUDE SUR LE ROLE DE L ANALYSE ECONOMETRIQUE ETC. 619 
CHAPTER IV 
PROBLEMS CONNECTED WITH TECHNICAL CHANGE - 
SETTING THE BASES FOR A GENERAL DYNAMIC ANALYSIS 
t. Technical progress in macro-economic models 
The case of the previous chapter — despite its popularity 
among theoretical economists — remains a very particular case 
of economic growth. In practice, as soon as we look beyond 
a single period of time, there is another series of changes that 
ake place besides those of population: the changes in the 
‘echnical methods of production. These changes are in fact 
much more problematical and much more complex than those 
concerning population. 
Technical change has been the great neglected factor in 
economic analysis. Only in the last fifteen years have econo- 
mists begun to deal with it through the elaboration of models 
of economic growth. All these models with technical progress, 
however, have been developed in macro-economic terms, i.e. 
with the implicit assumption that one single commodity (or a 
composite commodity of invariable composition) is being pro- 
duced in the svstem (!). And technical change has been in- 
"') After the path-breaking contribution of Harrop and DoMar, already 
mentioned, the macro-economic models of growth which have been elaborated 
are so many as to be alreadv difficult to count. On the whole, two main 
streams of thought have emerged. The first one has tried to pursue 
Harrop-DoMmar’s Keynesian approach in various directions, and the second 
has tried to insert HarROD-DOMAR’s ideas into the traditional neoclassical 
10] Pasinetti - pag. 40