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A Schumpeterian Growth Model with Heterogenous Firms

  • A. Minniti
  • C.P. Parello
  • P.S. Segerstrom

A common assumption in the Schumpeterian growth literature is that the innovation size is constant and identical across industries. This is in contrast with the empirical evidence which shows that: (i) the innovation size is far from being identical across industries; and (ii) the size distribution of profit returns from innovation is highly skewed toward the low value side, with a long tail on the high value side. In the present paper, we develop a Schumpeterian growth model that is consistent with this evidence. In particular, we assume that when a firm innovates, the size of its quality improvement is the result of a random draw from a Pareto distribution. This enables us to extend the class of quality-ladder growth models to encompass firm heterogeneity. We study the policy implications of this new set-up numerically and find that it is optimal to heavily subsidize R&D for plausible parameter values. Although it is optimal to tax R&D for some parameter values, this case only occurs when the steady-state rate of economic growth is very low.

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Paper provided by Dipartimento Scienze Economiche, Universita' di Bologna in its series Working Papers with number 645.

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Date of creation: Oct 2008
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Handle: RePEc:bol:bodewp:645
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  7. Chol-Won Li, 2003. "Endogenous Growth Without Scale Effects: Comment," American Economic Review, American Economic Association, vol. 93(3), pages 1009-1017, June.
  8. Klemperer, Paul, 1990. "How Broad Should the Scope of Patent Protection Be?," CEPR Discussion Papers 392, C.E.P.R. Discussion Papers.
  9. Aghion, P. & Howitt, P., 1989. "A Model Of Growth Through Creative Destruction," Working papers 527, Massachusetts Institute of Technology (MIT), Department of Economics.
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  18. repec:dgr:tuecis:0417 is not listed on IDEAS
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