In a professional services firm, top management unexpectedly adjusted the pay of consultants in some divisions to the pay in other divisions. In this quasi experiment, fixed wages increased and bonuses decreased, reducing pay for the high performers and increasing it for the low performers. Individual outputs and efforts decreased by 30%, and attrition and absenteeism increased. The effects were driven by those who were rationally expecting to lose from the pay change. Observing a period of more than 3 years, we show long-term negative reciprocity of those affected but no negative selection effects of new hires.

We investigate how changes in the commitment power of a principal affect cooperation among agents who work in a team. When the principal and her agents are symmetrically uncertain about the agents’ innate abilities, workers have career concerns. Then, unless the principal can commit herself to long‐term wage contracts, an implicit sabotage incentive emerges. Agents become reluctant to help their teammates. Anticipating this risk, and in order to induce the desired level of cooperation, the principal offers more collectively oriented incentive schemes. Temporary workers, though, are not affected by the sabotage effect, and their incentives are more individually oriented.

Widening and Deepening: Reforming the European Union by Erik Berglof, Mike Burkart, Guido Friebel and Elena Paltseva. Published in volume 98, issue 2, pages 133-37 of American Economic Review, May 2008

In a field experiment with a retail chain (1,300 employees, 193 shops), randomly selected sales teams received a bonus. The bonus increases both sales and number of customers dealt with by 3 percent. Each dollar spent on the bonus generates $3.80 in sales, and $2.10 in profit. Wages increase by 2.2 percent while inequality rises only moderately. The analysis suggests effort complementarities to be important, and the effectiveness of peer pressure in overcoming free-riding to be limited. After rolling out the bonus scheme, the performance of the treatment and control shops converges, suggesting long-term stability of the treatment effect.

Employee referral programs (ERPs) are randomly introduced in a grocery chain. On direct effects, larger referral bonuses increase referral quantity but decrease quality, though the increase in referrals from ERPs is modest. However, the overall effect of having an ERP is substantial, reducing attrition by 15% and significantly decreasing labor costs. This occurs, partly, because referrals stay longer than nonreferrals, but, mainly, from indirect effects: nonreferrals stay longer in treated than in control stores. The most supported mechanism for these indirect effects is workers value being involved in hiring. Attrition impacts are larger in higher performing stores and better local labor markets.