"This paper presents a model of international trade that features heterogeneous firms, relative endowment differences across countries, and consumer taste for variety. The paper demonstrates that firm reactions to trade liberalization generate endogenous Ricardian productivity responses at the...

"This paper reviews the recent theoretical literature on heterogeneous firms and trade, which emphasizes firm selection into international markets and reallocations of resources across firms. We discuss the empirical challenges that motivated this research and its relationship to traditional...

In an influential paper entitled David Ricardo's Discovery of Comparative Advantageʺ, which was published in HOPE (Vol. 34, 2002), Roy J. Ruffin attempted to reconstruct the circumstances of Ricardo's discovery of the law of comparative advantage. Ruffin's article has inspired a number of...