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Gravity Estimation of the Intensive and Extensive Margins of Trade: An Alternative Procedure with Alternative Data

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  • Harry Flam
  • Hakan Nordström
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    Abstract

    Helpman, Melitz and Rubinstein (2008) derive gravity equations to estimate effects of trade barriers on the intensive and extensive margins of trade. They exploit the frequency of zeros in aggregate bilateral trade data to identify effects on the extensive margin and to obtain controls for firm level heterogeneity and sample selection on the intensive margin. By using data on the number of bilaterally traded products we improve on identification and allow estimation of the extensive margin when data contain only positive trade flows. We also control for the pervasive presence of heteroscedasticity in trade data. The heterogeneity and selection biases are shown to be small and unimportant whereas the heteroscedasticity bias is large and important.

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    File URL: http://www.cesifo-group.de/portal/page/portal/DocBase_Content/WP/WP-CESifo_Working_Papers/wp-cesifo-2011/wp-cesifo-2011-03/cesifo1_wp3387.pdf
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    Bibliographic Info

    Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number 3387.

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    Date of creation: 2011
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    Handle: RePEc:ces:ceswps:_3387

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    Related research

    Keywords: gravity estimation; heteroscedasticity in data; intensive and extensive margin;

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    1. J.M.C. Santos Silva & Silvana Tenreyro, 2008. "Trading Partners and Trading Volumes:Implementing the Helpman-Melitz-Rubinstein Model Empirically," Economics Discussion Papers 662, University of Essex, Department of Economics.
    2. J. M. C. Santos Silva & Silvana Tenreyro, 2006. "The Log of Gravity," The Review of Economics and Statistics, MIT Press, vol. 88(4), pages 641-658, November.
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