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Das Romer-Modell mit qualitaetsverbesserndem technischem Fortschritt

  • Wolfgang Kornprobst
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    In bedeutenden Modellen der neuen Wachstumstheorie wird Wachstum entweder durch eine zunehmende Produktvielfalt oder durch Qualitaetsverbesserungen bestehender Produkte modelliert. Wachstum im Romer- Modell (Romer (1990a)) basiert auf einer zunehmenden Anzahl von Produkten, bei Grossman und Helpman wird Wachstum durch eine zunehmende Qualitaet bestehender Produkte generiert (Grossman & Helpman 1991a, Kap. 4). Beide Modelle haben Vorzuege. Das Romer-Modell erklaert die Entwicklung des aggregierten Kapitalstocks besser und kann als erweitertes Solow-Modell mit endogener Erklaerung des technischen Fortschritts verstanden werden. Das Qualitaetenmodell von Grossman und Helpman wird der Sicht Schumpeters eher gerecht, dass Wachstum durch kreative Zerstoerung entsteht. Indem junge Firmen bestehende Produkte verbessern, verdraengen sie die alten Firmen mit den schlechteren Produkten. Die Oekonomie profitiert, weil staendig bessere Produkte verfuegbar werden. Ausserdem wird bei Grossman/Helpman der Forschungsprozess treffender modelliert: Es liegt Unsicherheit ueber den Erfolg von Forschung vor. Im Romer- Modell gibt es diese Unsicherheit nicht. Das vorliegende Modell verbindet die Vorteile beider Modelle. Es behaelt die Struktur des Romer-Modells, implementiert aber Schumpeters Sicht ueber wirtschaftlichen Fortschritt.

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    File URL: http://www.bgpe.de/texte/DP/014_kornprobst.pdf
    File Function: First version, 2007
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    Paper provided by Bavarian Graduate Program in Economics (BGPE) in its series Working Papers with number 014.

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    Length: 50 pages
    Date of creation: Jan 2007
    Date of revision:
    Handle: RePEc:bav:wpaper:014_kornprobst
    Contact details of provider: Web page: http://www.bgpe.de/

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    1. Miguel-Angel Martín & Agustín Herranz, 2004. "Human capital and economic growth in Spanish regions," International Advances in Economic Research, Springer;International Atlantic Economic Society, vol. 10(4), pages 257-264, November.
    2. Aghion, P. & Howitt, P., 1990. "A Model Of Growth Through Creative Destruction," DELTA Working Papers 90-12, DELTA (Ecole normale supérieure).
    3. Grossman, G.M. & Helpman, E., 1989. "Quality Ledders In The Theory Of Growth," Papers 148, Princeton, Woodrow Wilson School - Public and International Affairs.
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    5. Arnold, Lutz G., 2005. "Multi-Country Endogenous Growth Models," University of Regensburg Working Papers in Business, Economics and Management Information Systems 404, University of Regensburg, Department of Economics.
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