This paper builds a framework for the analysis of macroeconomic fluctuations that incorporates the endogenous determination of the number of producers over the business cycle. Economic expansions induce higher entry rates by prospective entrants subject to irreversible investment costs. The...

We develop a simple model of international trade with heterogeneous firms that is consistent with a number of stylized features of the data. In particular, the model predicts positive as well as zero trade flows across pairs of countries, and it allows the number of exporting firms to vary...

This chapter was prepared for the Handbook of International Economics (Vol. 5) edited by Gita Gopinath, Elhanan Helpman, and Kenneth Rogoff. We provide a review of the recent literature -- both theoretical and empirical -- analyzing the multi-dimensional connections between globalization and...

The response of entry and exit to adverse supply shocks, such as COVID-19, is amplified by nominal rigidities. This leads to further amplification in the response of aggregate demand. Firms' inability to adjust their prices induces further changes in profitability that engender additional...

The inefficiencies related to endogenous product creation and variety under monopolistic competition are two-fold: one static--the misalignment between consumers and producers regarding the value of a new variety; and one dynamic--time variation in markups. Quantitatively, the welfare costs of...

This paper builds a framework for the analysis of macroeconomic fluctuations that incorporates the endogenous determination of the number of producers over the business cycle. Economic expansions induce higher entry rates by prospective entrants subject to irreversible investment costs. The...

This paper studies the role of endogenous producer entry and product creation for monetary policy analysis and business cycle dynamics in a general equilibrium model with imperfect price adjustment. Optimal monetary policy stabilizes product prices, but lets the consumer price index vary to...