In the 1960s and 1970s Harrod shifted the emphasis of his research in economic dynamics from the study of business cycles (instability principle) to the investigation of the growth process. As part of that, he restated his concept of the natural growth rate as an optimum welfare rate. The...

[eng] SUMMARY Population theory which was such au important ingredient of classical economics receives too little attention in current theory This is surprising since the volume of investment requirements receives great attention ami population increase is the most iir.portant element in these...