@TechReport{iza:izadps:dp2833, author={Giorgi, Giacomo De and Pellizzari, Michele and Redaelli, Silvia}, title={Be as Careful of the Books You Read as of the Company You Keep: Evidence on Peer Effects in Educational Choices}, year={2007}, month={Jun}, institution={Institute of Labor Economics (IZA)}, address={Bonn}, type={IZA Discussion Paper}, number={2833}, url={https://www.iza.org/publications/dp2833}, abstract={In this paper we investigate whether peers’ behavior influences the choice of college major. Using a unique dataset of students at Bocconi University and exploiting the organization of teaching at this institution, we are able to identify the endogenous effect of peers on such decision through a novel identification strategy which solves the common econometric problems of studies of social interactions. Results show that, indeed, one is more likely to choose a major when many of her peers make the same choice. We estimate that, when it diverts students from majors in which they seem to have a relative ability advantage, this effect leads to lower average grades and graduation mark, a penalty that could cost up to 1,117 USD a year in the labor market.}, keywords={social interaction;education;peer effects;reflection}, }