Roy Weintraub wrote:
> Think Friedman on assumptions, Samuelson on 
> operationalism, Becker on family sociology, Hayek on psychology, Keynes on 
> probability, etc. How much of our study of Friedman say should focus on 
> his contribution's  importance among economists in contrast to his lack of 
> sophistication viewed from the perspective of philosophers of science?


'Keynes on probability'? At least one philosopher (Russell) regarded K as an 
expert in that field on the strength of his fellowship dissertation (later 
published.)

A. M. C. Waterman