This discussion paper resulted in an article in the 'Economic Journal (2007). Volume 117, issue 522, pages 1025-1050.<P> One of the main findings of a large body of gift exchange experiments is that in an incomplete contracts environment workers on average do not shirk and usually provide more than...</p>

This discussion paper resulted in the article <I>Journal of Economic Education</I> (2008), 39(4), 357-373.<P> This paper describes a classroom experiment that illustrates the research and development investment incentives facing firms when technological spillovers are present. The game involves two stages...</p></i>

This discussion paper has resulted in a publication in the <A href="http://www.sciencedirect.com/science/article/pii/S0167487011001048">'Journal of Economic Psychology'</A> 32(6) 918-39.<P>This experimental study is concerned with the impact of the timing of the resolution of risk onpeople's willingness to take risks, with a special focus on the role of affect. While the...</p></a>

This paper studies behavior in experiments with a linear voluntary contributions mechanism for public goods conducted in Japan, the Netherlands, Spain and the USA. The same experimental design was used in the four countries. Our 'contribution function' design allows us to obtain a view of...

We examine whether social preferences are determined by hormones. We do this by investigating whether markers for the strength of prenatal testosterone exposure (finger length ratios) and current exposure to progesterone and oxytocin (the menstrual cycle) are correlated with choices in social...

We examine how multitasking affects performance and check whether women are indeed better at multitasking. Subjects in our experiment perform two different tasks according to three treatments: one where they perform the tasks sequentially, one where they are forced to multitask, and one where...

This discussion paper resulted in a publication in <A href="http://www.sciencedirect.com/science/article/pii/S0899825611000571">'Games and Economic Behavior'</A>, 73(2), 573-94.<p>We consider repeated trust game experiments to study the interplay between explicit and relational incentives. After having gained experience with two payoff variations of the trust game, subjects in...</p></a>

We analyze gender differences in the trust game in a "behind the veil of ignorance" design. This method yields strategies that are consistent with actions observed in the classical trust game experiments. We observe that, on average, men and women do not differ in "trust", and that women are...

Social preference models were originally constructed to explain two things: why people spend money to affect the earnings of others and why the income of others influences reported happiness. We test these models in a novel experimental situation where participants face a risky decision that...

The effects of stake size on cooperation and punishment are investigated using a public goods experiment. We find that an increase in stake size does neither significantly affect cooperation nor, interestingly, the level of punishment.