Discussion Paper Details

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Title: Measuring Trade in Value Added with Firm-Level Data

Author(s): Rudolfs Bems and Ayumu Ken Kikkawa

Publication Date: January 2020

Keyword(s): Aggregation bias, global value chains and Input-Output Tables

Programme Area(s): International Macroeconomics and Finance

Abstract: Global Value Chains have proliferated economic policy debates. Yet a key concept---trade in value added---is likely mismeasured because of sectoral aggregation bias stemming from reliance on input-output tables. This paper uses comprehensive firm-level data on both domestic and international transactions to study this bias. We find that sectoral aggregation leads to overstated trade in value added and, correspondingly, understated import content of gross exports. The economic magnitude of the estimated bias varies from moderate to large---at 2-5 p.p. of gross exports for Belgium and 17 p.p. for China. We study how the interplay between within-sector heterogeneities in firm import and export intensities and firm size determine the magnitude of the sectoral aggregation bias.

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Bibliographic Reference

Bems, R and Kikkawa, A. 2020. 'Measuring Trade in Value Added with Firm-Level Data'. London, Centre for Economic Policy Research.