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Innovation vs. Imitation and the Evolution of Productivity Distributions

  • Michael Koenig

    ()

    (Stanford University)

  • Jan Lorenz

    ()

    (Carl-von-Ossietzky University)

  • Fabrizio Zilibotti

    ()

    (University of Zurich)

We develop a tractable dynamic model of productivity growth and technology spillovers that is consistent with the emergence of real world empirical productivity distributions. Firms can improve productivity by engaging in in-house R&D, or alternatively, by trying to imitate other firms’ technologies subject to limits to their absorptive capacities. The outcome of both strategies is stochastic. The choice between in-house R&D and imitation is endogenous, and based on firms’ profit maximization motive. Firms closer to the technological frontier have less imitation opportunities, and tend to choose more often in-house R&D, consistent with the empirical evidence. The equilibrium choice leads to balanced growth featuring persistent productivity differences even when starting from ex-ante identical firms. The long run productivity distribution can be described as a traveling wave with tails following Zipf’s law as it can be observed in the empirical data. Idiosyncratic shocks to firms’ productivities of R&D

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Paper provided by Stanford Institute for Economic Policy Research in its series Discussion Papers with number 11-008.

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Date of creation: Feb 2012
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Handle: RePEc:sip:dpaper:11-008
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