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How important is human capital? A quantitative theory assessment of world income inequality

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  • Andrés Erosa

    ()
    (IMDEA Ciencias Sociales)

  • Tatyana Koreshkova

    ()
    (Concordia University and CIREQ)

  • Diego Restuccia

    ()
    (University of Toronto)

Abstract

We develop a quantitative theory of human capital investments in order to evaluate the magnitude of cross-country differences in total factor productivity (TFP) that explains the variation in per-capita incomes across countries. We build a heterogeneous-agent economy with cross-sectional variation in ability, schooling, and expenditures on schooling quality. By embedding our analysis in a growth model with tradable and non-tradable sectors, we model sectorial productivity differences across countries, as documented in Hsieh and Klenow (2007). The parameters governing human capital production and random ability and taste processes are restricted by a set of cross-sectional data moments such as variances and intergenerational correlations of earnings and schooling, as well as slope coefficient and R2 in a Mincer regression. Our main finding is that human capital accumulation strongly amplifies TFP differences across countries: To explain a 20-fold difference in the output per worker the model requires a 5-fold difference in the TFP of the tradable sector, versus an 18-fold difference if human capital is fixed across countries. Moreover, we find that sectorial productivity differences play a prominent role in quantitative implications of the theory.

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Bibliographic Info

Paper provided by Instituto Madrileño de Estudios Avanzados (IMDEA) Ciencias Sociales in its series Working Papers with number 2009-11.

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Date of creation: 30 Sep 2009
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Publication status: Published in Review of Economic Studies 77(4), October 2010: 1421-1449
Handle: RePEc:imd:wpaper:wp2009-11

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  1. How important is human capital? A quantitative theory assessment of world income inequality
    by Christian Zimmermann in NEP-DGE blog on 2009-10-18 03:26:57
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