groups. We exploit quasi-random variation in vessels in port from weather events far out in the ocean to estimate how port … traffic influences air pollution and human health. We find that one additional vessel in a port over a year leads to 3 ….0 hospital visits per thousand Black residents within 25 miles of the port and only 1.0 per thousand for whites. We assess a port …

on actual competition and contract outcomes are ambiguous. We pool a decade of US federal procurement data to shed light …

We study spatially differentiated competition between charities by partnering with two foodbanks in two neighboring … spatially differentiated competition is characterized by sorting, crowding-in, and an absence of spillovers: Donors sort …