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Joseph Schumpeter argued that there are increasing returns in R & D both to size of R & D establishment and to firm size. This has been taken to imply that the combination of small firms into big ones would increase R & D output. Tests have been attempted in the literature looking at the relation between scale and R & D input. The present paper shows that these tests are inappropriate. Moreover, the stated conclusion as to R & D output does not follow from Schumpeter's hypothesis. Indeed, it is very nearly true that none of these propositions can be derived from any other.
Fisher et al. (Mon,) studied this question.