We nest an extended two-way fixed effect (ETWFE) estimator for staggered difference-in-differences within the structural gravity model. To test the ETWFE, we estimate the effects of regional trade agreements (RTAs). The results suggest that RTA estimates in the current gravity literature may be...

City-level policies often aim at attracting skilled workers by improving urban amenities. However, due to endogeneity problems, studies relying on revealed preferences have difficulties in providing evidence for the basic premise that skilled workers place a higher value on urban amenities than...

We note that the existence of the maximum likelihood estimates for Poisson regression depends on the data configuration. Because standard software does not check for this problem, the practitioner may be surprised to find that in some applications estimation of the Poisson regression is...

We extend the simulation results given in Santos-Silva and Tenreyro (2006, "The Log of Gravity", The Review of Economics and Statistics, 88, pp.641-658) by considering data generated as a finite mixture of gamma variates. Data generated in this way can naturally have a large proportion of zeros...

We examine how the adverse impacts of weather shocks are distributed through the trade network. Exploiting a rich, theoretically derived, fixed effects structure, we find significant negative short-run effects of high temperature on exports. A month with an average temperature above 30 °C...