Editing Principal–agent problem (section)

===Team production===
On a related note, Drago and Garvey (1997) use Australian survey data to show that when agents are placed on individual pay-for-performance schemes, they are less likely to help their coworkers. This negative effect is particularly important in those jobs that involve strong elements of "team production" ([[Alchian]] and Demsetz 1972), where output reflects the contribution of many individuals, and individual contributions cannot be easily identified, and compensation is therefore based largely on the output of the team. In other words, pay-for-performance increases the incentives to free-ride, as there are large positive externalities to the efforts of an individual team member, and low returns to the individual (Holmström 1982, McLaughlin 1994).

The negative incentive effects implied are confirmed by some empirical studies, (e.g., Newhouse, 1973) for shared medical practices; costs rise and doctors work fewer hours as more revenue is shared. Leibowitz and Tollison (1980) find that larger law partnerships typically result in worse cost containment. As a counter, peer pressure can potentially solve the problem (Kandel and Lazear 1992), but this depends on peer monitoring being relatively costless to the individuals doing the monitoring/censuring in any particular instance (unless one brings in social considerations of norms and group identity and so on). Studies suggest that profit-sharing, for example, typically raises productivity by 3–5% (Jones and Kato 1995, Knez and Simester 2001), although there are some selection issues (Prendergast).