How much does peer pressure do to us ?

People behave differently under the peer pressure. When our classmate, co-worker or spouse is particularly hard-working, dishonest or lazy, how do we behave? In a scarily detailed experiment, the productivity of supermarket worker were measured in the lens of 'Peer Effect'. In a supermarket, "a quick worker will tend to lighten the burden on their colleagues. That might encourage them to slack off, or it might encourage them to work harder". Research find that workers working close to someone who is 10% quicker (than average) will raise their own productivity by 1.7%.