In the previous two decades there has been considerable progress in recognizing biases due to selectivity that are associated with the use of observational data to make causal inferences and in developing models to control for these biases statistically. Often there is a difference between...

Social embeddedness appears to be a promising way to analyze knowledge collaborations, notably to better understand their build up and their spatial patterns. Nevertheless, measurement problems and an over-territorialized conception of the notion exist. When studying the formation of these...

Using data from the CPS this paper examines the role of birth-country networks on immigrants' unemployment duration from 2001 to 2013. We find that networks significantly lower unemployment duration for all immigrants. Varying the effect of networks over duration categories we find that networks...