This paper utilizes survey data of Taiwan's real estate brokers to analyze the effects of peer pressure on individual's own performance within a workgroup. Extending the theoretical model of Kandel and Lazear (1992), we find that peer pressure will increase individual broker's performance and the effect is reinforced under a bonus scheme. We propose a corresponding empirical model and estimate it using fixed-effects. Furthermore, we adopt a two-stage fixed-effect model to examine the endogeneity problem of the peer-pressure variable. The empirical results show that peer pressure has a positive effect on individual's performance and the effect with a bonus scheme is greater than the effect without non-bonus scheme.