The research team, led by Wei Pan, analyzed all kinds of factors to tabulate the “social-tie density” of different cities–that’s the average number of people each resident will interact with personally. They looked at everything from the number of call partners with whom a cellphone user will end up sharing a cell tower to the number of people connecting through location-based social networks like Foursquare to the contagion rates of diseases spread only through personal contact. And they found that the higher a city’s social-tie density, the higher its levels of productivity and patents awarded.
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