Evans, David S.; Heckman, James J. - In: Management Science 34 (1988) 1, pp. 27-38
Our study of the Bell System cost function shows that it is possible to reject the hypothesis that AT&T was a natural monopoly. Our study is based on a regression analysis of a translog cost function estimated on 1947--1977 data. Charnes, Cooper, and Sueyoshi (Charnes, A., W. W. Cooper, T....