How does an increase in the size of the market due to fertility, immigration, or trade integration, affect welfare and real GDP? We study this question using a model with heterogeneous firms, fixed costs, and monopolistic competition. We decompose the change in welfare into changes in technical...

A tension between entry and rents lies at the core of a general theory of aggregation with scale effects. This paper characterizes the responses of macro aggregates to micro shocks in disaggregated economies with general forms of entry, internal or external returns to scale, input-output...

We study supply and demand shocks in a general disaggregated model with multiple sectors, multiple factors, input-output linkages, downward nominal wage rigidities, credit-constraints, and a zero lower bound. We use the model to understand how the Covid-19 crisis, an omnibus of supply and demand...

We use a five-age epidemiological model, combined with 66-sector economic accounting, to address a variety of questions concerning the economic reopening. We calibrate/estimate the model using contact survey data and data on weekly historical individual actions and non-pharmaceutical...

We study the effects of negative supply shocks and shocks to the composition of final demand on aggregate output in a disaggregated neoclassical model with multiple sectors, factors, and input-output linkages. We show how nonlinearities associated with complementarities in consumption and...

How does an increase in market size, say due to globalization, affect welfare? We study this question using a model with monopolistic competition, heterogeneous markups, and fixed costs. We characterize the change in welfare in the decentralized equilibrium, and decompose it into changes in...

We characterize the response of aggregate output to micro shocks in disaggregated economies with entry, non-constant returns to scale, input-output linkages, and distortions. We decompose output changes into technical and allocative efficiency components, and show that the latter depends on...

Consider an n-person Nash Bargaining problem where players bargain over the division of a cake whose size is stochastic. In such a game, the players are not only bargaining for more cake, but they are also sharing risk. This paper examines and provides the solution to this problem and highlights...

In diesem Artikel werden die wirtschaftlichen Auswirkungen eines möglichen Stopps russischer Energieimporte auf die deutsche Wirtschaft diskutiert. Wir zeigen, dass die Auswirkungen wahrscheinlich substanziell, aber handhabbar sein werden. Kurzfristig würde ein Stopp der russischen...