DISCUSSION .

In this article the author comments on the research papers on technological inventions and economic activity put forth by economist William D. Nordhaus and K.J. Arrow. He argues that Nordhaus' empirical testing of the relation between inventive activity and the growth of productivity has not been positive. The author points out that the number of patents taken need not be a good measure of inventive activity. Nordhaus' second test, the relation between economic activity and invention gave a positive result. The author does not agree with Arrow's de-emphasis of the role played by economic factors in "bias" in technological progress. Technological progress and theory of economic growth problems cannot be solved without mathematical knowledge. The author is impressed by the strikingly micro character of the process of invention and of technological change. The research papers introduced by above two economists helps to understand increases in productivity and it is suggested in the article that their approach is being directing in different directions.