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Das Romer-Modell mit qualitätsverbesserndem technischen Fortschritt

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Author Info
Kornprobst, Wolfgang
Abstract

In bedeutenden Modellen der neuen Wachstumstheorie wird Wachstum entweder durch eine zunehmende Produktvielfalt oder durch Qualitätsverbesserungen bestehender Produkte modelliert. Wachstum im Romer-Modell (Romer (1990)) basiert auf einer zunehmenden Anzahl von Produkten, bei Grossman und Helpman wird Wachstum durch eine zunehmende Qualität bestehender Produkte generiert (Grossman & Helpman 1991a, Kap. 4). Beide Modelle haben Vorzüge. Das Romer-Modell erklärt die Entwicklung des aggregierten Kapitalstocks besser. Das Qualitätenmodell von Grossman und Helpman wird der Sicht Schumpeters eher gerecht, dass Wachstum durch kreative Zerstörung entsteht. Indem junge Firmen bestehende Produkte verbessern, verdrängen sie die alten Firmen mit den schlechteren Produkten. Die Ökonomie profitiert, weil ständig bessere Produkte verfügbar werden. Außerdem wird bei Grossman/Helpman der Forschungsprozess treffender modelliert: Es liegt Unsicherheit über den Erfolg von Forschung vor. Im Romer-Modell gibt es diese Unsicherheit nicht. Das vorliegende Modell verbindet die Vorteile beider Modelle. Es behält die Struktur des Romer-Modells, implementiert aber Schumpeters Sicht über wirtschaftlichen Fortschritt.

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Paper provided by University of Regensburg, Department of Economics in its series Regensburger Diskussionsbeiträge zur Wirtschaftswissenschaft with number 412.

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Date of creation: 29 Jun 2006
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Handle: RePEc:bay:rdwiwi:672

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Related research
Keywords: endogenous growth; quality improvements; Wachstumstheorie / Endogenes Wirtschaftswachstum; Wachstumstheorie;

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Find related papers by JEL classification:
O40 - Economic Development, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - General
O30 - Economic Development, Technological Change, and Growth - - Technological Change - - - General

References listed on IDEAS
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  1. Nordhaus, William D, 1998. "Quality Change in Price Indexes," Journal of Economic Perspectives, American Economic Association, vol. 12(1), pages 59-68, Winter. [Downloadable!] (restricted)
  2. Segerstrom, Paul S, 1998. "Endogenous Growth without Scale Effects," American Economic Review, American Economic Association, vol. 88(5), pages 1290-1310, December. [Downloadable!] (restricted)
  3. Federico Etro, 2004. "Innovation by leaders," Economic Journal, Royal Economic Society, vol. 114(495), pages 281-303, 04. [Downloadable!] (restricted)
  4. Arnold, Lutz G., 2005. "Multi-Country Endogenous Growth Models," Regensburger Diskussionsbeiträge zur Wirtschaftswissenschaft 404, University of Regensburg, Department of Economics. [Downloadable!]
  5. Mark Bils & Peter J. Klenow, 2001. "Quantifying Quality Growth," American Economic Review, American Economic Association, vol. 91(4), pages 1006-1030, September. [Downloadable!] (restricted)
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  6. Gene M. Grossman & Elhanan Helpman, 1991. "Quality Ladders in the Theory of Growth," NBER Working Papers 3099, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  7. Aghion, Philippe & Howitt, Peter, 1992. "A Model of Growth through Creative Destruction," Econometrica, Econometric Society, vol. 60(2), pages 323-51, March. [Downloadable!] (restricted)
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  8. Romer, Paul M, 1990. "Endogenous Technological Change," Journal of Political Economy, University of Chicago Press, vol. 98(5), pages S71-102, October. [Downloadable!] (restricted)
    Other versions:
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