There is growing concern, particularly in policy circles, that rural manufacturing plants may be less likely to export than metro area plants, and that this may exacerbate the economic difficulties of rural America. A variety of reasons have been offered to expect this export gap, but little...

This research explores the effects of within-group heterogeneity on group-level productivity. It establishes that observed genetic diversity of 230 worldwide ethnic groups, as well as predicted genetic diversity of 1,331 ethnic groups across the globe, has a hump-shaped effect on economic...