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Oliver Williamson has coined the term "fundamental transformation". It captures the following situation: before they strike a deal, buyer and seller are protected by competition. Yet thereafter they find themselves in a bilateral monopoly. With common knowledge of standard preferences, both sides conclude the contract regardless if its expected value exceeds their outside options. We run an experiment to test whether additional behavioral reasons deter mutually beneficial trade. If the risk materializes, another individual makes a windfall profit. She does so by intentionally exploiting the first individual. The first individual is let down, although she has knowingly exposed herself to this risk. Participants sell the opportunity to enter the contractual relationship at a price below its expected value. This effect is driven by risk aversion, and already present if the risk is stochastic. Behavioral effects are heterogeneous. About a quarter of participants exhibit the hypothesized additional deterrent effect.

Large, macroeconomic shocks in the past have been shown to influence economic decisions in the present. We study in an experiment with 743 subjects whether small-scale, seemingly negligible, events also affect the formation of risk preferences. In line with a reinforcement learning model, we find that subjects who won a random lottery took significantly more risk in a second lottery almost a year later. The same pattern emerges in another experiment with 136 subjects where the second lottery was played more than three years after the first lottery. So, small-scale, random, events affect the formation of risk preferences significantly.

Understanding the roots of human cooperation among strangers is of great importance for solving pressing social dilemmas and maintening public goods in human societies. We study the development of cooperation in 929 young children, aged 3 to 6. In a unified experimental framework, we examine which of three fundamental pillars of human cooperation − direct and indirect reciprocity as well as third-party punishment - emerges earliest as an effective means to increase cooperation in a repeated prisoner's dilemma game. We find that third-party punishment exhibits a strikingly positive effect on cooperation rates by doubling them in comparison to a control condition. It promotes cooperative behavior even before punishment of defectors is applied. Children also engage in reciprocating others, showing that reciprocity strategies are already prevalent at a very young age. However, direct and indirect reciprocity treatments do not increase overall cooperation rates, as young children fail to anticipate the benefits of reputation building. We also show that the cognitive skills of children and the socioeconomic background of parents play a vital role in the early development of human cooperation.

How society invests in human capital is important for economic growth and social welfare. The paper reports from the first experiment designed to elicit people’s preferences for how to prioritize educational resources, where 2,000 Americans trade off educational resources between quick and slow learners. I find that they give strong priority to slow learners and assign two thirds of the educational resources to this group. Both cost efficiency and the motivation of the learners causally affect the resource allocation. The findings provide important insights for the present policy debate on how to distribute educational resources in society.

We measure the prevalence of discrimination between Jordanian host and Syrian refugee children attending school in Jordan. Using a simple sharing experiment, we find only a small degree of out-group discrimination. However, Jordanian children with Palestinian roots do not discriminate at all, suggesting that a family history of refugee status can generate solidarity with new refugees. We also find that parents’ narratives about the refugee crisis are correlated with their children's degree of out-group discrimination, particularly among Syrian refugee children, suggesting that discriminatory preferences are being transmitted through parental attitudes.

We measure the willingness to compete of entrepreneurs and salaried workers in an experiment. We let participants choose between a piece-rate and a tournament scheme either in private or in public. We find that in the private condition entrepreneurs are less competitive than salaried workers, but that in the public condition this ordering is reversed. Data from a follow-up survey suggest that social image concerns of entrepreneurs and perceived norms can explain why entrepreneurs are more competitive when decisions are publicly observable. Our survey also reveals that more competitive entrepreneurs earn higher profits in their businesses.

Credence goods markets – like for health care or repair services – with their informational asymmetries between sellers and customers are prone to fraudulent behavior of sellers and resulting market inefficiencies. We present the first model that considers both diagnostic uncertainty of sellers and the effects of insurance coverage of consumers in a unified framework. We test the model’s predictions in a laboratory experiment. Both in theory and in the experiment diagnostic uncertainty decreases the rate of efficient service provision and leads to less trade. In theory, insurance also decreases the rate of efficient service provision, but at the same time it also increases the volume of trade, leading to an ambiguous net effect on welfare. In the experiment, the net effect of insurance coverage on efficiency turns out to be positive. We also uncover an important interaction effect: if consumers are insured, experts invest less in diagnostic precision. We discuss policy implications of our results.

We measure the prevalence of discrimination between Jordanian host and Syrian refugee children attending school in Jordan. Using a simple sharing experiment, we find only little discrimination. Among the Jordanian children, however, we see that those who descended from Palestinian refugees do not discriminate at all, suggesting that a family history of refugee status can generate solidarity with new refugees. We also find that parents' narratives about the refugee crisis are correlated with the degree of discrimination, suggesting that discriminatory preferences are being transmitted through parental attitudes.

Tournament incentives prevail in labor markets. Yet, the number of tournament winners is often unclear to competitors. While it is hard to measure how this uncertainty affects work performance and willingness to compete in the field, it can be studied in a controlled lab experiment. We present a novel experiment where subjects can compete against each other, but the number of winners is either uncertain (but with known probabilities) or ambiguous (with unknown probabilities for different numbers of winners). We compare these two conditions to a control treatment with a known number of winners. We find that ambiguity induces a significant increase in the performance of men who choose to compete, while we observe no change for women. Men also increase their willingness to enter competition in the presence of ambiguity. Overall, both effects contribute to men winning the tournament significantly more often than women under uncertainty and ambiguity. These findings suggest that management should make tournament conditions transparent and information available in order to prevent gender disparities from increasing under uncertainty and ambiguity.

The effectiveness of social interaction depends strongly on an ability to coordinate actions efficiently. In large networks, such coordination may be very difficult to achieve and may depend on the communication technology and the network structure. We examine how pre-play communication and clustering within networks affect coordination in a challenging experimental game on eight-person networks. Free-form chat is enormously effective in achieving the non-equilibrium efficient outcome in our game, but restricted communication (where subjects can only indicate their intended action) is almost entirely ineffective. We can rationalize this result with a novel model about the credibility of cheap-talk messages. This credibility is much larger with free-form message communication than with restricted communication. We are the first to model this credibility and show, both theoretically and experimentally, an interaction effect of network structure and communication technologies. We also provide a model of message diffusion, which indeed predicts that diffusion will be more rapid without clustering and is consistent with our data.

Public goods are dealt with in two literatures that neglect each other. Mechanism design advises a social planner that expects individuals to misrepresent their valuations. Experiments study the provision of the good when preferences might be non-standard. We introduce the problem of the mechanism design literature into a public good experiment. Valuations for the good are heterogeneous. To each group we add a participant with power to impose a contribution scheme. We study four settings: the authority has no personal interest and (1) valuations are common knowledge or (2) active participants may misrepresent their types; the authority has a personal interest (3) and must decide before learning her own valuation or (4) knows her own valuation. Disinterested social planners predominantly choose a payment rule that gives every group member the same ?nal payoff, even if misrepresentation is possible. Authorities are overly optimistic about truth telling. Interested social planners abuse their power, except if the opportunity cost of a more balanced rule is small.

Experimental participants are more likely to follow an arbitrary rule the more others in their reference group do so as well. The effect is most pronounced for individuals who follow few rules when not knowing others’ behavior. Unlike what is observed for conditional cooperation, learning that only few others follow a rule does not reduce rule following. Keywords: conditional rule following, deontological motives, conditional cooperation, experiment JEL: A13, C91, D03, D63, K42

Under common law, the standard remedy for breach of contract is expectation damages. Under continental law, the standard is specific performance. The common law solution is ex post efficient. But is it also ex ante efficient? We use experimental methods to test whether knowing that non-fulfilment will only lead to damages deters mutually beneficial trade. The design excludes aversion against others willfully breaking their promises. We find that there is indeed less trade if specific performance is not guaranteed, provided the preference for the traded commodity is sufficiently pronounced.

Tournament incentives prevail in labor markets, in particular with respect to promotions. Yet, it is often unclear to competitors how many winners there will be or how many applicants compete in the tournament. While it is hard to measure how this uncertainty affects work performance and willingness to compete in the field, it can be studied in a controlled lab experiment. We present a novel experiment where subjects can compete against each other, but where the number of winners is either uncertain (i.e., unknown numbers of winners, but known probabilities) or ambiguous (unknown probabilities for different numbers of winners). We compare these two conditions with a control treatment with a known number of winners. We find that ambiguity induces a significant increase in performance of men, while we observe no change for women. Both men and women increase their willingness to enter competition with uncertainty and ambiguity, but men react slightly more than women. Overall, both effects contribute to men winning the tournament significantly more often than women under uncertainty and ambiguity. Hence, previous experiments on gender differences in competition may have measured a lower bound of differences between men and women.

On the doctrinal surface, there is a deep divide between common and continental law when it comes to the origin of contractual obligations. Under continental law, in principle a unilateral promise suffices. Common law by contrast requires consideration. When it comes to deciding cases, the divide is much less pronounced. But for the most part the law does not govern people's lives through adjudication. It matches or molds their moral intuitions. We test these intuitions in the lab. If consideration is required, participants believe that all participants make more ambitious promises. But they themselves make a more cautious promise. These two effects cancel out, so that promises are not more likely to be kept with consideration.

This paper experimentally studies an essential institutional feature of matching markets: Randomization of allocation priorities. I compare single and multiple randomization in the student assignment problem with ties. The Gale-Shapley deferred acceptance algorithm is employed after indifferences in school priorities are resolved by either random procedure. The main result is that a significant fraction of individuals prefers multiple to single randomization, although both are equivalent in expectation. Multiple randomization is perceived to be fairer. One theoretical explanation is the failure to disregard compound lotteries. These results show that random procedures are not inherently neutral with respect to preferences and fairness perceptions.

In three distinct disciplines, crime and punishment are studied experimentally: in empirical legal studies, in experimental economics, and an experimental criminology. These three disciplines have surprisingly little interaction. The current paper surveys the rich evidence, and discusses the methodological reasons for running experiments on these issues, the limitations of the method, and how they can be mitigated.