We investigate potential mechanisms of information transmission among patients when explaining territorial variations in the use of cesarean sections. Defining networks as mothers living in the same Italian municipality (average size approximately 10,000 residents), we show that a one standard...

In this paper we test the celebrated `Strength of weak ties' theory of Granovetter (1973). We test two hypotheses on the network structure in a data set of collaborating economists. While we find support for the hypothesis of transitivity of strong ties, we reject the hypothesis that weak ties...