The Economic Impact of Social Ties: Evidence from German Reunification

Abstract

We use the fall of the Berlin Wall in 1989 to identify a causal effect of social ties on regional economic growth. We show that households who have social ties to East Germany in 1989 experience a persistent rise in their personal incomes after the fall of the Berlin Wall. Moreover, the presence of these households significantly affects economic performance at the regional level: it increases the returns to entrepreneurial activity, the share of households who become entrepreneurs, and the likelihood that firms based within a given West German region invest in East Germany. As a result, West German regions which (for idiosyncratic reasons) have a high concentration of households with social ties to the East exhibit substantially higher growth in income per capita in the early 1990s. A one standard deviation rise in the share of households with social ties to East Germany in 1989 is associated with a 4.6 percentage point rise in income per capita over six years. We interpret our findings as evidence that social ties between individuals can indeed facilitate economic growth.

Keywords: economic development, German Reunification, migration, networks, social ties

JEL Classification: J61, L14, O11