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Margins, Gravity, and Causality: Export Diversification and Income Levels Reconsidered

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  • Mau, Karsten

Abstract

The paper shows that the relationship between GDP per capita and levels of specialization can be predicted differently depending on whether the intensive or the extensive margin is considered. It shows that at the extensive margin countries continuously diversify their exports and that cross-sectional patterns can be captured well by a gravity equation. Prior studies documenting nonmonotone patterns with respecialization appear to have obtained their results from sample-selection bias, the omitted log-transformation of the income variable, and the neglect of control variables. Furthermore, results from dynamic panel analyses (system GMM) suggest that causality goes in both directions, with income having a contemporaneous impact on diversification, while the feedback effect of diversification on GDP per capita may be delayed. This pattern fits into theoretical rationales that view diversification as driven by technology or efficiency and where diversification generates additional revenues as it proves to be persistent.

Suggested Citation

  • Mau, Karsten, 2014. "Margins, Gravity, and Causality: Export Diversification and Income Levels Reconsidered," GIGA Working Papers 249, GIGA German Institute of Global and Area Studies.
  • Handle: RePEc:zbw:gigawp:249
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    More about this item

    Keywords

    diversification; extensive margin; international trade; technology; gravity equation;
    All these keywords.

    JEL classification:

    • F11 - International Economics - - Trade - - - Neoclassical Models of Trade
    • F14 - International Economics - - Trade - - - Empirical Studies of Trade
    • F43 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Economic Growth of Open Economies
    • O40 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - General
    • O11 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Macroeconomic Analyses of Economic Development

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