The Keynesian Revolution was, in the form in which it succeeded in the United States, a revolution in method. This was not Keynes’s intent, nor is it… - Robert Lucas

I do not see how one can look at figures like these without seeing them representing possibilities. Is there some action a government of India could take that would lead the Indian economy to grow like Indonesia's or Egypt's? If so, what exactly? If not, what is it about the "nature of India" that makes it so? The consequences for human welfare involved in questions like these are simply staggering: once one starts to think about them, it is hard to think about anything else.

A key element in all Keynesian models is a ‘trade-off between inflation and real output: the higher is the inflation rate; the higher is output (or equivalently, the lower is the rate of unemployment).

For policy, the central fact is that Keynesian policy recommendations have no sounder basis, in a scientific sense, than recommendations of non-Keynesian economists or, for that matter, non-economists.