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Explaining Differences in the Productivity of Capital Across Countries in the Context of 'New' Growth Theory

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  • Kevin S. Nell
  • A.P. Thirlwall

Abstract

The purpose of this paper is to explain differences in the productivity of capital across countries taking 84 rich and poor countries over the period 1980-2011, and to test the orthodox neoclassical assumption of diminishing returns to capital. The marginal product of capital is measured as the ratio of the long-run growth of GDP to a country’s investment ratio. Twenty potential determinants are considered using a general-to-specific model selection procedure. Education, government consumption, geography, export growth, openness, political rights and macroeconomic instability turn out to be the most important variables. The data also suggest constant returns to capital, so investment matters for long-run growth.

Suggested Citation

  • Kevin S. Nell & A.P. Thirlwall, 2014. "Explaining Differences in the Productivity of Capital Across Countries in the Context of 'New' Growth Theory," Studies in Economics 1412, School of Economics, University of Kent.
    • Handle: RePEc:ukc:ukcedp:1412
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    File URL: https://www.kent.ac.uk/economics/repec/1412.pdf
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    References listed on IDEAS

    as
    1. Gallup, John L. & Sachs, Jeffrey D. & Mellinger, Andrew, "undated". "Geography and Economic Development," Instructional Stata datasets for econometrics geodata, Boston College Department of Economics.
    2. Jeffrey D. Sachs & Andrew Warner, 1995. "Economic Reform and the Process of Global Integration," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 26(1, 25th A), pages 1-118.
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    Cited by:

    1. Kevin S. Nell & A.P. Thirlwall, 2017. "Why does the productivity of investment vary across countries?," PSL Quarterly Review, Economia civile, vol. 70(282), pages 213-245.

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    More about this item

    Keywords

    new growth theory; investment; productivity of capital;
    All these keywords.

    JEL classification:

    • O11 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Macroeconomic Analyses of Economic Development
    • O33 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Technological Change: Choices and Consequences; Diffusion Processes
    • O43 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Institutions and Growth
    • O47 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Empirical Studies of Economic Growth; Aggregate Productivity; Cross-Country Output Convergence

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