Justin Cook, Jason Fletcher, 17 September 2017

While diversity can lead to more innovation and better problem solving, it can also cause competition and conflict. This column examines the effect of genetic diversity among high school students in Wisconsin on their socioeconomic outcomes later in life. Genetic diversity is associated with more years of schooling, and higher job prestige and income. Students from more genetically diverse schools score higher on indexes of openness and extraversion.

Ruiqing Cao, Theresa Kuchler, Johannes Stroebel, Arlene Wong, 08 September 2017

Systematic analyses of social connectedness and social networks have traditionally been complicated by a lack of high-quality, large-scale data. This column uses data on friendship links on Facebook to construct a new measure of social connectedness between US counties, and between US counties and foreign countries. Social networks in the US are quite local, and both national and international networks are substantially shaped by historical events and migration patterns. The populations of US counties with more geographically dispersed social networks are generally richer and better educated, and have higher life expectancy and greater social mobility.

Axel Dreher, Martin Gassebner, Paul Schaudt, 12 August 2017

Stricter immigration and visa policies are a common reaction to terrorist attacks. This column uses historical data from 20 OECD countries to show that while the number of terror attacks increased with the number of foreigners living in a host country, migrants were not more likely to become terrorists than the locals of the country in which they were living. The results also show that bans on Muslim immigration would be more likely to increase the risk of terror than make the domestic population safer.

Rikard Eriksson, Andrés Rodríguez-Pose, 08 August 2017

While job-related mobility is key to knowledge sharing, it may also undermine on-the-job training through labour poaching, and assessing its overall impact on productivity and growth is not straightforward. This column uses data on nearly 2.7 million new hires in Sweden to analyse the impact of labour mobility on plant performance. The greatest positive impact is seen in the country’s three largest cities, while firms in other large urban and university regions emerge as the biggest losers from job mobility.

Michael Clemens, Jennifer Hunt, 21 July 2017

Sudden inflows of refugees have been shown to have little or no impact on native wages, but recent research has challenged this consensus, using instrumental variables to show uniformly large detrimental effects. This column argues that these new results were due to problems with the strategy used and, in the case of the Mariel boatlift, the composition of the sample. Correcting for these flaws, the impact of immigration on average native-born workers remains small and inconsistent, with no evidence to show a large detrimental impact on less-educated workers.

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