“…The idea that peer effects drive performance is not new. Such effects have been demonstrated in diverse contexts including retail (Mas & Moretti, ; Chan, Li, & Pierce, ), finance (Hwang, Liberti, & Sturgess, ), and scientific innovation (Azoulay, Graff‐Zivin, & Wang, ; Catalini, ; Oettl, ). Peers share knowledge, provide help, and set performance expectations (e.g., Herbst & Mas, ; Housman & Minor, ; Mas & Moretti, ).…”