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Country Size, International Trade, and Aggregate Fluctuations in Granular Economies

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  • Julian di Giovanni
  • Andrei A. Levchenko

Abstract

This paper proposes a new mechanism by which country size and international trade affect macroeconomic volatility. We study a multi-country, multi-sector model with heterogeneous firms that are subject to idiosyncratic firm-specific shocks. When the distribution of firm sizes follows a power law with an exponent close to -1, the idiosyncratic shocks to large firms have an impact on aggregate output volatility. We explore the quantitative properties of the model calibrated to data for the 50 largest economies in the world. Smaller countries have fewer firms, and thus higher volatility. The model performs well in matching this pattern both qualitatively and quantitatively: the rate at which macroeconomic volatility decreases in country size in the model is very close to what is found in the data. Opening to trade increases the importance of large firms to the economy, thus raising macroeconomic volatility. Our simulation exercise shows that the contribution of trade to aggregate fluctuations depends strongly on country size: in the largest economies in the world, such as the U.S. or Japan, international trade increases volatility by only 1.5-3.5%. By contrast, trade increases aggregate volatility by some 15-20% in a small open economy, such as Denmark or Romania.

Suggested Citation

  • Julian di Giovanni & Andrei A. Levchenko, 2011. "Country Size, International Trade, and Aggregate Fluctuations in Granular Economies," NBER Working Papers 17335, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:17335
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    JEL classification:

    • F12 - International Economics - - Trade - - - Models of Trade with Imperfect Competition and Scale Economies; Fragmentation
    • F15 - International Economics - - Trade - - - Economic Integration
    • F41 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Open Economy Macroeconomics

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