We develop a simple model of international trade with heterogeneous firms that is consistent with a number of stylized features of the data. In particular, the model predicts positive as well as zero trade flows across pairs of countries, and it allows the number of exporting firms to vary across destination countries. As a result, the impact of trade frictions on trade flows can be decomposed into the intensive and extensive margins, where the former refers to the trade volume per exporter and the latter refers to the number of exporters. This model yields a generalized gravity equation that accounts for the self-selection of firms into export markets and their impact on trade volumes. We then develop a two-stage estimation procedure that uses a selection equation into trade partners in the first stage and a trade flow equation in the second. We implement this procedure parametrically, semi-parametrically, and non-parametrically, showing that in all three cases the estimated effects of trade frictions are similar. Importantly, our method provides estimates of the intensive and extensive margins of trade. We show that traditional estimates are biased, and that most of the bias is not due to selection but rather due to the omission of the extensive margin. Moreover, the effect of the number of exporting firms varies across country pairs according to their characteristics. This variation is large, and particularly so for trade between developed and less developed countries and between pairs of less developed countries.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
12927.
Length: Date of creation: Feb 2007 Date of revision: Handle: RePEc:nbr:nberwo:12927
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Find related papers by JEL classification: F10 - International Economics - - Trade - - - General F12 - International Economics - - Trade - - - Models of Trade with Imperfect Competition and Scale Economies F14 - International Economics - - Trade - - - Country and Industry Studies of Trade
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James E. Anderson & Eric van Wincoop, 2004.
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James E. Anderson & Eric van Wincoop, 2004.
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Simeon Djankov & Rafael La Porta & Florencio LopezdeSilanes & Andrei Shleifer, 2000.
"The Regulation of Entry,"
NBER Working Papers
7892, National Bureau of Economic Research, Inc.
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Cited by: (explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)
Andrew B. Bernard & J. Bradford Jensen & Stephen J. Redding & Peter K. Schott, 2007.
"Firms in International Trade,"
NBER Working Papers
13054, National Bureau of Economic Research, Inc.
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Andrew B. Bernard & J. Bradford Jensen & Stephen Redding & Peter K. Schott, 2007.
"Firms in International Trade,"
CEP Discussion Papers
dp0795, Centre for Economic Performance, LSE.
[Downloadable!]
Andrew Bernard & J. Bradford Jensen & Stephen Redding & Peter Schott, 2007.
"Firms in International Trade,"
Working Papers
07-14, Center for Economic Studies, U.S. Census Bureau.
[Downloadable!]