The strength of strong ties: How co-authorship affect productivity of academic economists?

Increased specialization and extensive collaboration are common behaviours in the scientific community, as well as the evaluation of scientific research based on bibliometric indicators. This paper aims to analyse the effect of collaboration (co-authorship) on the scientific output of Italian economists. We use social network analysis to investigate the structure of co-authorship, and econometric analysis to explain the productivity of individual Italian economists, in terms of \u2018attributional\u2019 variables (such as age, gender, academic position, tenure, scientific sub-discipline, geographical location), \u2018relational\u2019 variables (such as propensity to cooperate and the stability of cooperation patterns) and \u2018positional\u2019 variables (such as betweenness and closeness centrality indexes and clustering coefficients)