IDEAS home Printed from
   My bibliography  Save this paper

Technological-Knowledge Dynamics in Lab-Equipment Models of Quality Ladders


  • Pedro Mazeda Gil

    () (Faculdade de Economia, Universidade do Porto and CEMPRE, Rua Dr Roberto Frias, 4200-464, Porto, Portugal.)

  • Óscar Afonso

    () (Faculdade de Economia, Universidade do Porto and CEMPRE, Rua Dr Roberto Frias, 4200-464, Porto, Portugal.)


The Perpetual Inventory Model (PIM) assumes that, in each period, an arbitrary constant fraction of technological-knowledge stock is lost. By connecting the aggregate resource constraint with firms’ market value, we give a theoretical background to the PIM by showing that the technological-knowledge accumulation follows a dynamic process with an endogenous depreciation rate, which remains stable in steady state. Moreover, we relate different concepts of technological-knowledge used in the literature.

Suggested Citation

  • Pedro Mazeda Gil & Óscar Afonso, 2008. "Technological-Knowledge Dynamics in Lab-Equipment Models of Quality Ladders," FEP Working Papers 283, Universidade do Porto, Faculdade de Economia do Porto.
  • Handle: RePEc:por:fepwps:283

    Download full text from publisher

    File URL:
    Download Restriction: no

    Other versions of this item:

    References listed on IDEAS

    1. Jurgen Bitzer & Andreas Stephan, 2007. "A Schumpeter-inspired approach to the construction of R&D capital stocks," Applied Economics, Taylor & Francis Journals, vol. 39(2), pages 179-189.
    2. Tor Jakob Klette & Samuel Kortum, 2004. "Innovating Firms and Aggregate Innovation," Journal of Political Economy, University of Chicago Press, vol. 112(5), pages 986-1018, October.
    3. Ricardo J. Caballero & Adam B. Jaffe, 1993. "How High are the Giants' Shoulders: An Empirical Assessment of Knowledge Spillovers and Creative Destruction in a Model of Economic Growth," NBER Chapters,in: NBER Macroeconomics Annual 1993, Volume 8, pages 15-86 National Bureau of Economic Research, Inc.
    4. Jungsoo Park, 2004. "International and Intersectoral R&D Spillovers in the OECD and East Asian Economies," Economic Inquiry, Western Economic Association International, vol. 42(4), pages 739-757, October.
    5. Segerstrom, Paul S & Zolnierek, James M, 1999. "The R&D Incentives of Industry Leaders," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 40(3), pages 745-766, August.
    6. Luis A. Rivera-Batiz & Paul M. Romer, 1991. "Economic Integration and Endogenous Growth," The Quarterly Journal of Economics, Oxford University Press, vol. 106(2), pages 531-555.
    7. Argentino Pessoa, 2005. "“Ideas” driven growth: the OECD evidence," Portuguese Economic Journal, Springer;Instituto Superior de Economia e Gestao, vol. 4(1), pages 46-67, April.
    Full references (including those not matched with items on IDEAS)

    More about this item


    endogenous growth; endogenous depreciation rate; Perpetual Inventory Model; technological-knowledge dynamics;

    JEL classification:

    • O30 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - General
    • O41 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - One, Two, and Multisector Growth Models

    NEP fields

    This paper has been announced in the following NEP Reports:


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:por:fepwps:283. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.