Many economic, political and social environments can be described as contests in which agents exert costly efforts while competing over the distribution of a scarce resource. These environments have been studied using Tullock contests, all-pay auctions and rank-order tournaments. This survey provides a comprehensive review of experimental research on these three canonical contests. First, we review studies investigating the basic structure of contests, including the number of players and prizes, spillovers and externalities, heterogeneity, risk and incomplete information. Second, we discuss dynamic contests and multi-battle contests. Then we review studies examining sabotage, feedback, bias, collusion, alliances, group contests and gender, as well as field experiments. Finally, we discuss applications of contests and suggest directions for future research. IntroductionMany economic, political and social environments can be described as contests in which competing agents have the opportunity to expend scarce resources -such as effort, money, time, or troops -in order to affect the probabilities of winning prizes. Examples range from the competition for mates, college admission, patents, or promotions within firms, to the process of litigation or lobbying politicians, to elections, sports competitions, and violent global conflicts (Tullock, 1967;Krueger, 1974). As is obvious from this list, these environments have attracted considerable attention in applications in a wide range of fields, both in-and out-side of economics. They have also been studied extensively by economic theorists in what has become known as the field of contest theory (Konrad, 2009). Although this field continues to attract many young theorists, it has its roots in three models developed in the mid-seventies to early eighties: the Tullock (1980) model of rent-seeking, the Lazear and Rosen (1981) rank-order tournament model, and the all-pay auction (Hirshleifer and Riley, 1978;Nalebuff and Stiglitz, 1983;Dasgupta, 1986;Hillman and Riley, 1989). Despite the fact that the three models historically developed somewhat independently, they represent special cases of a general contest model that can be formulated in a unified framework.Despite an extensive and established theoretical literature, much less effort has been devoted to empirically investigate individual behavior in different contests and compare such behavior with theoretical predictions. The main reason is that it is not trivial to measure individual effort in the field since the researcher can only observe the performance of contestants, which is a function of effort, ability and luck (Ericsson and Charness, 1994). The majority of empirical studies use either firm level data (Prendergast, 1999) or sports data (Szymanski, 2003). Because it is typically difficult to measure the actual effort expended by players in the field, almost all of these studies focus solely on investigating whether the pattern of outcomes is consistent with the theoretical predictions.Controlled experimen...

Many economic, political and social environments can be described as contests in which agents exert costly efforts while competing over the distribution of a scarce resource. These environments have been studied using Tullock contests, all-pay auctions and rank-order tournaments. This survey provides a review of experimental research on these three canonical contests. First, we review studies investigating the basic structure of contests, including the contest success function, number of players and prizes, spillovers and externalities, heterogeneity, and incomplete information. Second, we discuss dynamic contests and multibattle contests. Then we review research on sabotage, feedback, bias, collusion, alliances, and contests between groups, as well as real-effort and field experiments. Finally, we discuss applications of contests to the study of legal systems, political competition, war, conflict avoidance, sales, and charities, and suggest directions for future research.

This experiment compares the performance of two contest designs: a standard winnertake-all tournament with a single fixed prize, and a novel proportional-payment design in which that same prize is divided among contestants by their share of total achievement. We find that proportional prizes elicit more entry and more total achievement than the winner-take-all tournament. The proportional-prize contest performs better by limiting the degree to which heterogeneity among contestants discourages weaker entrants, without altering the performance of stronger entrants. These findings could inform the design of contests for technological and other improvements, which are widely used by governments and philanthropic donors to elicit more effort on targeted economic and technological development activities.JEL Classifications: C72, D72, J33

This article experimentally studies a two-stage elimination contest and compares its performance with a one-stage contest. Contrary to the theory, the two-stage contest generates higher revenue than the equivalent one-stage contest. There is significant over-dissipation in both stages of the two-stage contest and experience diminishes over-dissipation in the first stage but not in the second stage. Our experiment provides evidence that winning is a component in a subject's utility. A simple behavioral model that accounts for a non-monetary utility of winning can explain significant over-dissipation in both contests. It can also explain why the two-stage contest generates higher revenue than the equivalent one-stage contest.JEL Classifications: C72, C91, D72

Costless pre-play communication has been found to effectively facilitate coordination and enhance efficiency in games with Pareto-ranked equilibria. We report an experiment in which two groups compete in a weakest-link contest by expending costly efforts. Allowing intra-group communication leads to more aggressive competition and greater coordination than control treatments without any communication. On the other hand, allowing inter-group communication leads to less destructive competition. As a result, intra-group communication decreases while inter-group communication increases payoffs. Our experiment thus provides an example of an environment where communication can either enhance or damage efficiency. This contrasts sharply with experimental findings from public goods and other coordination games, where communication always enhances efficiency and often leads to socially optimal outcomes. JEL Classifications: C70, D72, H41

We provide an overview of experimental literature on contests and point out the two main phenomena observed in most contest experiments: (i) overbidding relative to the standard Nash equilibrium prediction and (ii) heterogeneous behavior of ex-ante symmetric contestants. Based on the sample of contest experiments that we review, the median overbidding rate is 72%. We provide different explanations for the overbidding phenomenon, including bounded rationality, utility of winning, other-regarding preferences, probability distortion, and the shape of the payoff function. We also provide explanations for heterogeneous behavior of contestants based on differences in preferences towards winning, inequality, risk and losses, and demographic differences. Furthermore, we suggest mechanisms that can reduce overbidding and induce more homogeneous behavior. Finally, we discuss directions for future research.JEL Classifications: C72, C91, C92, D72, D74

This article experimentally studies a two-stage elimination contest and compares its performance with a one-stage contest. Contrary to the theory, the two-stage contest generates higher revenue than the equivalent one-stage contest. There is significant over-dissipation in both stages of the two-stage contest and experience diminishes over-dissipation in the first stage but not in the second stage. Our experiment provides evidence that winning is a component in a subject's utility. A simple behavioral model that accounts for a non-monetary utility of winning can explain significant over-dissipation in both contests. It can also explain why the two-stage contest generates higher revenue than the equivalent one-stage contest.JEL Classifications: C72, C91, D72

Motivated by problems of coordination failure observed in weak-link games, we experimentally investigate behavioral spillovers for minimum-and median-effort coordination games. Subjects play these coordination games simultaneously and sequentially. The results show that successful coordination on the Pareto optimal equilibrium in the median game influences behavior in the minimum game when the games are played sequentially. Moreover, this positive, Pareto-improving spillover is present even when group composition changes across games, although the effect is not as strong. We also find that the precedent for uncooperative behavior in the minimum game does not influence play in the median game. These findings suggest guidelines for increasing cooperative behavior within organizations. JEL Classifications: C72, C91