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Correlation between upstreamness and downstreamness in random global value chains

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  • Bartolucci, Silvia
  • Caccioli, Fabio
  • Caravelli, Francesco
  • Vivo, Pierpaolo

Abstract

This paper is concerned with upstreamness and downstreamness of industries and countries in global value chains. Upstreamness and downstreamness measure respectively the average distance of an industrial sector from final consumption and from primary factors of production, and they are computed from the most used global Input–Output tables databases, e.g., the World Input–Output Database (WIOD). Recently, Antràs and Chor reported a puzzling and counter-intuitive finding in data from the period 1995-2011, namely that (at country level) upstreamness appears to be positively correlated with downstreamness, with a correlation slope close to +1. This effect is stable over time and across countries, and it has been confirmed and validated by later analyses. We first analyze a simple model of random Input/Output tables, and we show that, under minimal and realistic structural assumptions, there is a natural positive correlation emerging between upstreamness and downstreamness of the same industrial sector/country, with correlation slope equal to +1. This effect is robust against changes in the randomness of the entries of the I-O table and different aggregation protocols. Secondly, we perform experiments by randomly reshuffling the entries of the empirical I-O table where these puzzling correlations are detected, in such a way that the global structural constraints are preserved. Again, we find that the upstreamness and downstreamness of the same industrial sector/country are positively correlated with slope close to +1, even though the random reshuffling has destroyed any underlying economic information about inter-sectorial connections and trends. Our results – rooted in the Complexity Science approach to economic problems – strongly suggest that (i) extra care is needed when interpreting these measures as simple representations of each sector's positioning along the value chain, as the “curse of the input–output identities” and labor effects effectively force the value chain to acquire additional links from primary factors of production, and (ii) the empirically observed puzzling correlation may rather be a necessary consequence of the few structural constraints (positive entries, and sub-stochasticity) that Input/Output tables and their surrogates must meet, in turn making other proposed measures of sector inter-linkages more suitable and intuitive.

Suggested Citation

  • Bartolucci, Silvia & Caccioli, Fabio & Caravelli, Francesco & Vivo, Pierpaolo, 2025. "Correlation between upstreamness and downstreamness in random global value chains," LSE Research Online Documents on Economics 127637, London School of Economics and Political Science, LSE Library.
    • Handle: RePEc:ehl:lserod:127637
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    References listed on IDEAS

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    1. Pol Antràs & Davin Chor, 2013. "Organizing the Global Value Chain," Econometrica, Econometric Society, vol. 81(6), pages 2127-2204, November.
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    More about this item

    Keywords

    correlations; downstreamness; global value chains; input/output; upstreamness;
    All these keywords.

    JEL classification:

    • F14 - International Economics - - Trade - - - Empirical Studies of Trade
    • F15 - International Economics - - Trade - - - Economic Integration
    • C67 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Input-Output Models
    • D57 - Microeconomics - - General Equilibrium and Disequilibrium - - - Input-Output Tables and Analysis
    • L14 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Transactional Relationships; Contracts and Reputation
    • 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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