Applied general and partial equilibrium models are widely used tools for ex ante analysis of trade policy changes. However, simulation results seem to exhibit significant variation across publications, and the often criticised ‘black box’ character of applied trade models makes meaningful...

We perform a meta-analysis of 110 studies that report simulated global welfare gains from trade liberalization under the WTO Doha Development Agenda (DDA) to test for hidden, author-specific model specification effects. We find that after controlling for other factors that influence simulation...