We derive a simple equation for the welfare gains from trade when tariffs are liberalized or iceberg trade costs fall. Covering various one-sector trade models that may or may not feature extensive margins and imperfect competition, we generalize the analysis of Arkolakis, Costinot and...

Human Capital, Trade and Public Policy in Rapidly Growing Economies argues that only two centuries ago, no society had ever enjoyed sustained growth in living standards. The contributors to this book aim to discover why the world today exhibits a predilection for perpetual self-improvement. In...