The delicate and intricate pattern of competition and cooperation in the economic behavior of the hundreds of thousands of citizens of Stockholm offers a challenge to the economist that is perhaps as complex as the challenges of the physicist and the chemist.

The main insight learned from interdisciplinary studies is the return to specialization

There is only one social science and we are its practitioners

...the number of saintly men has not yet risen to the level where the census makes them a separate statistical category.

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.

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

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