My teaching began in 1936 at Iowa State College where T. W. Schultz was the department chairman.

That subject has lost its one time appeal to economists as our science has become more abstract, but my interest has even grown more intense as the questions raised by the sociology of science became more prominent.

Mathematics has no symbols for confused ideas.

I met my wife, Margaret L. Mack, at the University of Chicago. We were married in 1936. She died in 1970.

There is only one social science and we are its practitioners

I recall my mother asking in about 1946 what I was and I replied proudly that I was a professor. A decade later she repeated her question and I repeated my answer. "No promotion?" was her comment.

A Swedish physicist can not discuss his work with fifty people unless he goes abroad. A Swedish economist can get opinions and instructions in his native language from thousands upon thousands of his fellow citizens.