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Berger and Pope (2011) show that being slightly behind increases the likelihood of winning in professional (National Basketball Association; NBA) and collegiate (National Collegiate Athletic Association; NCAA) basketball. We extend their analysis to large samples of Australian football, American football, and rugby matches, but find no evidence of such an effect for these three sports. When we revisit the phenomenon for basketball, we only find supportive evidence for NBA matches from the period analyzed in Berger and Pope (2011). There is no significant effect for NBA matches from outside this sample period, for NCAA matches, or for matches from the Women’s National Basketball Association. High-powered meta-analyses across the different sports and competitions do not reject the null hypothesis of no effect of being slightly behind on winning. The confidence intervals suggest that the true effect, if existent at all, is likely relatively small.

Is punishment of free riders driven by descriptive social norms of cooperation and punishment? We conduct experiments in which participants interact in a one-shot social dilemma with punishment. We study how punishment of free riders is influenced by behavior among members of a payoff-irrelevant reference group. Participants can condition punishment on either the level of cooperation or the level of punishment in the reference group, respectively reflecting descriptive norms of cooperation and punishment. We observe considerable heterogeneity in punishment behavior. Among punishers, the most common strategies are to increase punishment with higher levels of cooperation ("norm enforcement"), and to increase punishment with higher levels of punishment in the reference group ("conformist punishment"). By means of a simple dynamic model, we demonstrate that these conditional punishment strategies can substantially promote cooperation: conformist punishment helps cooperation to gain a foothold in a population, and norm enforcement helps to maintain cooperation at high levels. Our study illustrates how punishment is shaped by the social context, and highlights the potential of conditional punishment strategies to promote the emergence and maintenance of cooperation.

We demonstrate that a person's eye gaze and his/her competitiveness are closely intertwined in social decision making. In an exploratory examination of this relationship, Study 1 uses field data from a high-stakes TV game show to demonstrate that the frequency by which contestants gaze at their opponent's eyes predicts their defection in a variant on the prisoner's dilemma. Studies 2 and 3 use experiments to examine the underlying causality and demonstrate that the relationship between gazing and competitive behavior is bi-directional. In Study 2, fixation on the eyes, compared to the face, increases competitive behavior toward the target in an ultimatum game. In Study 3, we manipulate the framing of a negotiation (cooperative vs. competitive) and use an eye tracker to measure fixation number and time spent fixating on the counterpart's eyes. We find that a competitive negotiation elicits more gazing, which in turn leads to more competitive behavior.

This paper examines the effect of incentives on the performance of darts players. We analyze four data sets comprising a total of 123,402 darts matches of professional, amateur, and youth players. The game of darts offers an attractive natural research setting, because performance can be observed at the individual level and without the obscuring effects of risk considerations and the behavior of others. We find that amateur and youth players perform better under moderately higher incentives, but choke when the incentives are really high. Professional players similarly display better performance under higher incentives, but appear less susceptible of choking. These results speak to a growing literature on the limits of increasing incentives as a recipe for better performance.

Game-theoretic models of network formation typically assume that people create relations so as to maximize their own outcome in the network. Recent experiments on network formation suggest that the assumption of self-interest might be unwarranted and that social preferences, such as altruism and inequality aversion, play a role in the formation of social networks. We developed an experiment to systematically investigate whether people show preferences for outcomes of others during network formation. We find that such preferences play a role when network decisions degenerate to simple two-person decision tasks. In more complex environments, however, we find little evidence for social preferences as a significant decision criterion. Furthermore, we find some evidence for farsighted behavior in network formation.

In this chapter, we argue that game shows can be a useful source of data to study cooperative behavior. The unique combination of well-defined decision problems and large stakes makes game show data complementary to both experimental and field data. Over the past years, a number of TV shows have employed a vari- ant of the prisoner’s dilemma. We summarize the results of five different studies that use these shows to test a broad range of hypotheses. Finally, we discuss caveats of game show data, and contend that the potential problems are mostly not very different from those with experimental and field data.