Returns to Scale in Research and Development: What Does the Schumpeterian Hypothesis Imply?

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Abstract
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.

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