Two recent papers, Deaton (2009), and Heckman and Urzua (2009), argue against what they see as an excessive and inappropriate use of experimental and quasi-experimental methods in empirical work in economics in the last decade. They specifically question the increased use of instrumental...

This chapter (to appear in the forthcoming Handbook of International Economics, Vol. 5) develops a framework with which to interpret and survey answers to the question: how does increased openness affect aggregate welfare in a typical developing country? We decompose answers into four...

We study a non-parametric class of neoclassical trade models with global production networks. We characterize their properties in terms of sufficient statistics useful for growth and welfare accounting as well as for counterfactuals. We establish a formal duality between open and closed...

This paper derives bilateral trade from two cases of the Heckscher-Ohlin Model, both also representing a variety of other models as well. First is frictionless trade, in which the absence of all impediments to trade in homogeneous products causes producers and consumers to be indifferent among...

We develop a methodology to construct nonparametric counterfactual predictions, free of functional-form restrictions on preferences and technology, in neoclassical models of international trade. First, we establish the equivalence between such models and reduced exchange models in which...

This paper develops a new model with heterogeneous firms under perfect competition in a Heckscher-Ohlin-Samuelson setting. We show that trade need not make selection in the comparative advantage sector stricter as suggested by earlier work. Selection is driven by the capital intensity in entry...

Applied general equilibrium (AGE) models, which feature multiple countries, multiple industries, and input-output linkages across industries, have been the dominant tool for evaluating the impact of trade reforms since the 1980s. We review how these models are used to perform policy analysis and...

A free trade agreement supports global free trade since trade barriers tend to divert trade in favor of members, but not reduce imports. The term: 'mutual assured deterrence' is used to refer to a regional free trade association that has the feature that no member can gain individually from the...

In a model where all factors of production are imperfectly mobile, we argue that the Dixit-Norman scheme of commodity taxes may not lead to strict Pareto gains from trade. Rather, this scheme must be augmented by policies which give factors an incentive to move: hence, the role for trade...

We introduce quality differentiation and an extensive margin of products into a standard quantitative, general equilibrium model of international trade. Both the quality and the quantity of a product play a role in its contribution both to consumption and to production. The framework allows...