In this paper, we study a voluntary contribution mechanism withone-way communication. The relevance of one person’s words is assessedby assigning exogeniously the role of the ‘communicator’ to onegroup member. Contrary to the view that the mutual exchange ofpromises is necessary for the...

The "common effect" model in program evaluation assumes that all treated individuals have the same impact from a program. Our paper contributes to the recent literature that tests and goes beyond the common effect model by investigating impact heterogeneity using data from the experimental...

The higher our aspirations, the higher the probability that we have to adjust them downwards when forming more realistic expectations later on. This paper shows that the costs induced by high aspirations are not trivial. We first develop a theoretical framework to identify the factors that...

Three results emerge from a simple experiment on imitation. First, I find behavior which strongly suggests an intention to imitate. Second, players imitate successful other players rather than repeating successful actions. Third, to find imitation examples, players use several periods of memory....

In many environments, tournaments can elicit more effort from workers, except perhapswhen workers can sabotage each other. Because it is hard to separate effort, ability andoutput in many real workplace settings, the empirical evidence on the incentive effect oftournaments is thin...

Small and informal firms account for a large share of employment in developing countries.The rapid expansion of microfinance services is based on the belief that these firms haveproductive investment opportunities and can enjoy high returns to capital if given theopportunity...

Within a laboratory experiment we investigate a principal-agent game in which agents may,first, self-select into a group task (GT) or an individual task (IT) and, second, choose workeffort. In their choices of task and effort the agents have to consider pay contracts for bothtasks as offered by...

We present results from a field experiment testing the gift-exchange hypothesis inside a treeplantingfirm paying its workforce incentive contracts. Firm managers told a crew of treeplanters they would receive a pay raise for one day as a result of a surplus not attributable topast planting...

A two-persons bargaining problem often consists of initially incompatible demands that can be unilaterally reduced by sequential concessions. In a 2 x 2 x 2-factorial design we distinguish between reliable and unreliable concessions, between a static and dynamic settings and between symmetric...