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Trade policy · 2026

Border frictions and potential trade in the structural gravity model

Applied Economics Letters, 33(10), 1694–1698 · Online first: 2025

The paper

This article gives “potential trade” a concrete economic meaning: the trade that would occur if an exporter-specific border friction were removed. It shows how to calculate that friction and simulate the change using a structural gravity model.

Research findings

  • An international-trade gravity model, combined with an observation for domestic trade, can recover an exporter-specific border friction.
  • The counterfactual respects economy-wide resource constraints and changes in relative prices: additional exports involve a reallocation of trade, including from domestic sales.

Policy takeaways

  • Frame export-potential assessments around a defined change in trade costs, so the result has an interpretable economic basis.
  • Use general equilibrium analysis to assess the response across markets, rather than treating a gap between predicted and observed exports as automatically available growth.