Partner effects and collaborative learning
通过大学课堂随机配对实验，发现与能力更强的伙伴合作会降低个人学业成绩，尤其对男生影响更大，可能机制是搭便车和挫败感。
Individuals interact within small, and often unobservable, groups embedded in broader social contexts, which significantly shape peer dynamics and influence outcomes. Although peer effects are widely studied, their direction and impact are highly variable and context-dependent. This lack of consensus presents difficulties for decision-making in education, workplaces, and other settings, underscoring the importance of addressing subtle aspects of the interaction process effectively. We investigate the impact of partner interactions on learning outcomes in a setting combining collaborative and individual tasks. We conduct a field experiment using the simplest group structure possible—pairs—thus avoiding the endogenous formation of smaller peer groups. In particular, university students were randomly and repeatedly paired to sit together and collaborate during classroom activities. Our findings reveal a negative partner ability effect: an increase in partner ability reduces one’s academic outcomes. This effect is particularly pronounced when paired with more capable counterparts and for male students. Results remain robust across various specifications and sample definitions, among others. We explore potential mechanisms behind these results such as free-riding and discouragement. • Individuals interact in small groups within broader social contexts. • Peer effects vary widely, complicating decisions in education, work, and other areas. • We study partner effects in settings with collaborative and individual tasks. • The negative partner effect is particularly pronounced when paired with more capable counterparts and for male students. • We study potential mechanisms behind our results as free-riding and discouragement.