Social interactions are considered pivotal to agglomeration economies. We explore a unique dataset on mobile phone calls to examine how distance and population density shape the structure of social interactions. Exploiting an exogenous change in travel times, we show that distance is highly...

Peer interactions play a key role in the criminal sector due to its secrecy and lack of formal institutions. A significant part of criminal peer exposure happens in prison, directly influenced by policymakers. This paper provides a broader understanding of how peer effects shape criminal...

Knowledge production and scientific research have become increasingly more collaborative and international, particularly in pharmaceuticals. We analyze international research networks on the country level in different disease groups. Our empirical analysis is based on a unique dataset of...

In this paper we investigate the causal effect of immigration on trade flows, using Italian panel data covering very small geographical units (NUTS-3). Exploiting the very favorable setup offered by Italy's features - the very high number of countries of origin of immigrants ('super-diversity'),...

We study the effects of a German national cluster policy on the structure of collaboration networks. The empirical analysis is based on original data that was collected in fall 2011 and late summer 2013 with cluster actors (firms and public research organizations) who received government...

This paper provides new estimates of the effects of ethnic network on U.S. exports. In line with recent research, our dataset is a panel of exports from U.S. states to 29 foreign countries. Our analysis departs from the literature in two ways, both of which show that previous estimates of the...

This article analyzes the role of different elements of social capital in economic growth for a sample of 85 European regions during the period 1995-2008. Much has been said about social capital in the last two decades, but studies for the European regional context are scant, and those analyzing...