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Poor Substitutes? Counterfactual methods in IO and Trade compared

Author

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  • Keith Head
  • Thierry Mayer
Abstract
Constant elasticity of substitution (CES) demand for monopolistically competitive firm-varieties is a standard tool for models in international trade and macroeconomics. Inter-variety substitution in this model follows a simple share proportionality rule. In contrast, the standard toolkit in industrial organization (IO) estimates a demand system in which cross-elasticities depend on similarity in observable attributes. The gain in realism from the IO approach comes at the expense of requiring richer data and greater computational challenges. This paper uses the dataset of Berry et al. 1995, who established the modern IO method, to simulate counterfactual trade policy experiments. We use the CES model as an approximation of the more complex underlying demand system and market structure. Although the CES model omits key elements of the data generating process, the errors are offsetting, leading to reasonably accurate counterfactual predictions. For aggregate outcomes, it turns out that incorporating non-unitary pass-through matters more than fixing over-simplified substitution patterns. We do so by extending the commonly used methods of Exact Hat Algebra and tariff elasticity estimation to take into account oligopoly.

Suggested Citation

  • Keith Head & Thierry Mayer, 2021. "Poor Substitutes? Counterfactual methods in IO and Trade compared," Working Papers 2021-11, CEPII research center.
    • Handle: RePEc:cii:cepidt:2021-11
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    References listed on IDEAS

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    Cited by:

    1. Mohapatra, Debashrita, 2024. "Estimating substitution patterns and demand curvature in Discrete-Choice models of product differentiation," 2024 Annual Meeting, July 28-30, New Orleans, LA 343538, Agricultural and Applied Economics Association.

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    More about this item

    Keywords

    Constant Elasticity of Substitution; Industrial Organization; Oligopoly; Trade; Tariffs; Counterfactual analysis;
    All these keywords.

    JEL classification:

    • F1 - International Economics - - Trade

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