Poor countries must specialize in standardized. labor-intensive commodities. Middle income countries may have a richer menu of options available to them if their labor force is reasonably well-educated and skilled. This paper is motivated by the possibility that there may exist multiple...

Substantial research in development economics has highlighted the presence of weak institutions, market failures and distortions in developing countries. Yet, much of the knowledge generated in international trade comes from workhorse models that abstract from these frictions. This review...

The decline in the costs of multinational production (MP) has led some countries to specialize in innovation and others to specialize in production. To study the aggregate and distributional implications of this phenomenon, we develop a quantifiable general equilibrium model of trade and MP....

This paper develops an elementary theory of global supply chains. We consider a world economy with an arbitrary number of countries, one factor of production, a continuum of intermediate goods, and one final good. Production of the final good is sequential and subject to mistakes. In the unique...

Comparative advantage, whether driven by technology or factor endowment, is at the core of neoclassical trade theory. Using tools from the mathematics of complementarity, this paper offers a simple, yet unifying perspective on the fundamental forces that shape comparative advantage. The main...

The core subjects of trade theory are the pattern and volume of trade: which goods are traded by which countries, and how much of those goods are traded. The first part of the paper discusses evidence on comparative advantage, with an emphasis on carefully connecting theory models to data...

This paper embeds variable effort into a traditional multi-sector model. Effort enters a production function like total-factor-productivity and on the assumption that effort doesn't affect capital depreciation, the capital-cost savings from high effort operations are passed on to workers. The...

There are two principal theories of why countries trade: comparative advantage and increasing returns to scale. Yet there is no empirical work that assesses the relative importance of these two theories in accounting for production structure and trade. We use a framework that nests an increasing...

This paper is an effort to do international trade theory without mentioning countries. Nearly all models of the international economy assume that trade takes place between nations or regions which are themselves dimensionless points. We develop a model in which economic space is instead assumed...

This paper estimates the impact of external demand shocks on real income. Our empirical strategy is based on a first order approximation to a wide class of small open economy models that feature sector-level gravity in trade flows. The framework allows us to measure foreign shocks and...