Publications

We study the impact of foreign market entry and exit by firms on the trajectory of U.S. exports during and after the Great Recession. Using confidential microdata from the U.S. Census Bureau, we find that incumbent exporters were primarily responsible for the changes in aggregate foreign sales during these years. While there was a substantial decline in the number of firms that sold abroad in the midst of the crisis, new exporters during the recovery compensated for this by having larger foreign sales. Thus, while changes in foreign market participation drove substantial shifts in the variety of U.S. goods that were exported, overall they were less important for the trajectory of total foreign sales over time.

Employment declined substantially during the 2007–2009 recession, especially in small and young firms. Using confidential firm-level data of the universe of firms and a difference-in-differences methodology, this paper estimates that financial constraints reduced employment growth by 4 to 8 percentage points in small firms relative to large firms and by 7 to 9 percentage points in young relative to old firms. I find that the effect of financial constraints on small firms is driven to a large extent by young firms. I then document that financial constraints affected employment growth in small and young firms strongly through the entry and exit of firms.

Using an annual panel of US states over the period 1982-2014, we estimate the response of macroeconomic variables to a shock to the number of new firms (startups). We find that these shocks have significant effects that persist for many years on real GDP, productivity, and population. This is consistent with simple models of firm dynamics where a "missing generation" of firms affects productivity persistently.

Recent work in international finance suggests that exchange rate puzzles can be accounted for if (1) aggregate uncertainty is time-varying, and (2) countries have heterogeneous exposures to a world aggregate shock. We embed these features in a standard two-country real business cycle framework, and calibrate the model to equity risk premia in low and high interest rates countries. Unlike traditional real business cycle models, our model generates volatile exchange rates, a large currency forward premium, "excess comovement" of asset prices relative to quantities, and an imperfect correlation between relative consumption growth and exchange rates. Our model implies, however, that high interest rate countries have smoother quantities, equity returns and interest rates than low interest rate countries, contrary to the data.