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Edwin Leuven, Hessel Oosterbeek, Bas van der Klaauw

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In a randomized field experiment where first year university students could earn financial rewards for passing all first year requirements within one year we find small and non-significant average effects of financial incentives on the pass rate and the numbers of collected credit points. There is however evidence that high ability students collect significantly more credit points when assigned to (larger) reward groups. Low ability students collect less credit points when assigned to larger reward groups. After three years these effects have increased, suggesting dynamic spillovers. The small average effect in the population is therefore the sum of a positive effect for high ability students and a (partly) off-setting negative effect for low ability students. A negative effect of financial incentives for less able individuals is in line with research from psychology and recent economic laboratory experiments which shows that external rewards may be detrimental for intrinsic motivation.

Pieter A Gautier, Bas van der Klaauw

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We use data from a promotion campaign of NH-Hoteles to study self-selection of participants in a gift-exchange experiment. The promotion campaign allowed guests to pay any non negative amount of money for a stay in one of 36 hotels in Belgium and the Netherlands. The data allow us to distinguish between `regular guests', who booked prior to the announcement of the promotion campaign and guests who booked after the campaign was announced. During the promotion campaign we varied the posted price of a room that was communicated to the guests. Only the regular guests respond to the exogenous variation in the posted price and they pay substantially more on average. This different behavior cannot be explained by differences in satisfaction or observed compositional differences between both groups. We argue that the promotion campaign mainly attracted individuals who find it relatively unimportant to be viewed of as prosocial.