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Scale effects in endogenous growth theory: an error of aggregation not specification

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Abstract

Modern Schumpeterian growth theory focuses on the product line as the main locus of innovation and exploits endogenous product proliferation to sterilize the scale effect. The empirical core of this theory consists of two claims: (i) growth depends on average employment (i.e., employment per product line); (ii) average employment is scale invariant. We show that data on employment, R&D personnel, and the number of establishments in the US for the period 1964–2001 provide strong support for these claims. While employment and the total number of R&D workers increase with no apparent matching change in the long-run trend of productivity growth, employment and R&D employment per establishment exhibit no long-run trend. We also document that the number of establishments, employment and population exhibit a positive trend, while the ratio employment/establishment does not. Finally, we provide results of time series tests consistent with the predictions of these models.

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Authors and Affiliations

  1. Department of Economics, LeBow College of Business, Drexel University, 32nd & Market Sts., Philadelphia, PA, 19104, USA

    Christopher A. Laincz

  2. Department of Economics, Duke University, Durham, NC, 27710, USA

    Pietro F. Peretto

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  1. Christopher A. Laincz
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  2. Pietro F. Peretto
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Laincz, C.A., Peretto, P.F. Scale effects in endogenous growth theory: an error of aggregation not specification. J Econ Growth 11, 263–288 (2006). https://doi.org/10.1007/s10887-006-9004-9

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  • DOI: https://doi.org/10.1007/s10887-006-9004-9

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