This paper investigates the role that the entry and exit of heterogeneous firms plays in shaping aggregate fluctuations in economic activity. In so doing, it develops a dynamic stochastic general equilibrium model in which procyclical entry and countercyclical exit along a real business cycle...

We study an OLG economy where productivity growth comes from two alternative sources: process innovation and learning-by-doing. There is a trade-off between the two in so far as frequent technological updates reduce the scope for learning on existing technologies. A conflict is shown to arise...

We study the interactions between technological innovation, investment in human capital and child labor. In our setting new technologies require new skills and new skills can be developed only through schooling. In a two-stage game, first firms decide on innovation, then households decide on...

This paper takes a step towards formalizing the theoretical interconnections among four post-Industrial Revolution phenomena - the industrialization and growth take-off of rich 'northern' nations, massive global income divergence, and rapid trade expansion. Specifically, we present a stages-of...

Recent empirical evidence has highlighted how the export patterns of multi-product firms dominate world trade flows, and how these multi-product firms respond to different economic conditions across export markets by varying the number of products they export. In this paper, we further analyze...

This paper investigates the role that the entry and exit of heterogeneous firms plays in shaping aggregate fluctuations in economic activity. In so doing, it develops a dynamic stochastic general equilibrium model in which procyclical entry and countercyclical exit along a real business cycle...

We build a theoretical model of multi-product firms that highlights how market size and geography (the market sizes of and bilateral economic distances to trading partners) affect both a firm's exported product range and its exported product mix across market destinations (the distribution of...

How should multilateral trade policy be designed in a world in which countries differ in terms of market access and technology, and firms with market power differ in terms of productivity? We answer this question in a model of monopolistic competition in which variable markups increasing in firm...

Our objective is twofold. First, we show why there is a spatial question in economic theory - why a free competitive market is unable to cope with agglomeration and regional imbalance in the absence of market distortions. Second, using a new and simple model, we review what has been accomplished...

We develop a monopolistically competitive model of trade with firm heterogeneity - in terms of productivity differences - and endogenous differences in the 'toughness' of competition across markets - in terms of the number and average productivity of competing firms. We analyze how these...