This paper develops a fully-endogenous, variety-expansion growth model with firm-specific quality heterogeneity, limit pricing, and an endogenous distribution of markups. Trade induces only firms with high-quality products to export, whereas firms with low-quality products serve only the...

We propose a multi-country trade model with occupational choice, heterogeneous firms, and unemployment to analyze the effects of welfare-maximizing tariffs on welfare, jobs, and top incomes. Consistent with empirical evidence, the model features an employer size-wage premium, complete tariff...

The empirical relationship between trade protection and economic growth is surprisingly fragile, as shown in a number of other papers. After demonstrating this empirical sensitivity, we address one possible explanation for these findings: that the relationship is nonlinear. Following the...

We develop and estimate the steady-state growth equation of an augmented version of Romer's model of endogenous technical change that allows for population growth, human capital accumulation, diminishing returns to R&D, and technology diffusion. Estimates from international cross-section data...