From a very recent working paper draft by Max Posch and Itzchak Tzachi Raz:
We study how rising market integration shaped cooperative culture and behavior in the 1850–1920 United States. Leveraging plausibly exogenous changes in county-level market access driven by rail-road expansion and population growth, we show that increased market access fostered universalism, tolerance, and generalized trust—traits supporting cooperation with strangers—and shifted coopera-tion away from kin-based ties toward more generalized forms. Individual-level analyses of migrantsreveal rapid cultural adaptation after moving to more market-integrated places, especially among those exposed to commerce. These effects are unlikely to be explained by changes in population diversity,economic development, access to information, or legal institutions.
Here is the link.
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