The debate between Engelmann and Strobel (2004, 2006) and Fehr, Naef, and Schmidt (2006) highlights the important question of the extent to which lab experiments on student populations can serve to identify the motivational forces present in society at large. We address this question by...

Many verifiable contracts are impossible or difficult to enforce. This applies to contracts among family and friends, contracts regulating market transactions, and sovereign debt contracts. Do such non-enforceable contracts matter? We use a version of the trust game with participants from Norway...

The standard economic approach to tax policy has to a large extent relied on welfarist theories of justice, in particular the utilitarian view that the government should try to maximize the sum of individual welfare. This welfarist framework has proved a productive point of departure for much...

We conduct a large-scale intercultural experiment to elicit competitiveness and ask whether individual and gender differences in competitiveness are partially determined by nature. We use being a “lefty” (i.e., having either a dominant left hand or a dominant left foot) as a proxy for...

There is a striking difference in income inequality and redistributive policies between the United States and Scandinavia. To study whether there is a corresponding cross-country difference in social preferences, we conducted the first large-scale international social preference experiment, with...

The paper reports the first experimental study on people's fairness views on extreme Income inequalities arising from winner-take-all reward structures. We find that the majority of participants consider extreme income inequality generated in winner-take-all situations as fair, independent of...

The large experimental literature on competitiveness has typically ignored a key feature of many competitive settings in society: competition is not always fair. The playing field may be uneven and competitors of unequal strength. In our experiment, we systematically vary the fairness of the...

The standard approach to inequality measurement regards all inequalities as being unfair. However, most people do not share this view, and believe that some inequalities are fair. This paper shows one way of generalizing the standard approach to take account of the distinction between fair and...

We report from a large-scale randomized field experiment conducted on a unique sample of more than 15 000 taxpayers in Norway, who were likely to have misreported their foreign income. We find that the inclusion of a moral appeal or a sentence that increases the perceived probability of...

We report the results of a randomized controlled trial testing whether incentivizing physical exercise improves the academic performance of college students. As expected, the intervention increases physical activity. The main result is that it generates a strong and significant improvement in...