First year students at the Pontificia Universidad Católica de Chile, one of the leading Chilean universities, are randomly assigned to their first semester college class groups. This paper takes advantage of this natural experiment in order to robustly estimate the impact of peer...

We develop a Roy model of social interactions in which individuals sort into peer groups based on comparative advantage. Two key results emerge: First, when comparative advantage is the guiding principle of peer group organization, the effect of moving a student into an environment with...

We study workplace peer effects in fertility decisions using a game theory model of strategic interactions among coworkers that allows for multiple equilibria. Using register-based data on fertile-aged women working in medium sized establishments in Denmark, we uncover negative average peer...

Estimates on the effect of job contact method -- i.e., informal versus formal search -- on wage offers vary considerably across studies, with some of them finding a positive correlation between getting help from informal connections and obtaining high-paying jobs, while others finding a negative...

I conducted an artefactual field experiment to identify whether guilt reduces crime, and how the crime reduction effects of guilt change due to peer effects. Guilt aversion predicts the occurrence of peer effects caused by changes in guilt sensitivity and belief. I found supporting evidence of...

While the share of non-native students in a class is supposed to have a non positive effect on school achievement, little is said about the heterogeneity of the ethnic minority make-up. Ethnic diversity can stimulate the creativity of students, can push them to be proficient in the instructional...

We analyse peer effects among students of a middle-sized Italian public university. We explain students’ average grade in exams passed during their Second Level Degree course on the basis of their pre-determined measures of abilities, personal characteristics and peer group abilities. Thanks...

This paper examines the issue of whether workers learn productive skills from their co-workers, even if those skills are unethical. Specifically, we estimate whether Jose Canseco, a star baseball player in the late 1980’s and 1990’s, affected the performance of his teammates by introducing...

Using microdata on a sample of about 350 workers, employed at an Italian public institute, we explain individual absence rates both considering variables that may be related to health conditions and to variables that may suggest shirking behaviour. Among these variables we especially focus our...