We analyse interethnic cooperation in an infinitely repeated prisoner’s dilemma when members of one group are unable to target punishment towards individual defectors from the other group. We first show that indiscriminate outgroup punishment may sustain cooperation in this setting. Our main...

Strategy changes are an essential part of evolutionary games. Here we introduce a simple rule that, depending on the value of a single parameter w, influences the selection of players that are considered as potential sources of the new strategy. For positive w players with high payoffs will be...

In a world in which many pressing global issues require large scale cooperation, understanding the group size effect on cooperative behavior is a topic of central importance. Yet, the nature of this effect remains largely unknown, with lab experiments insisting that it is either positive or...

In traditional game theory, strategies are equivalent with actions and mixed strategies are the only extension. As a new extension, strategies are interpreted as plans. Although most plans are not very interesting (like doing a certain action), some conditional plans are. For example, they...

In the last few decades, numerous experiments have shown that humans do not always behave so as to maximize their material payoff. Cooperative behavior when non-cooperation is a dominant strategy (with respect to the material payoffs) is particularly puzzling. Here we propose a novel approach to...

While the so-called ‘refugee crisis’ in Europe led to the de facto suspension of the Dublin Regulation in 2015/2016, researchers and practitioners are well aware that the crisis only highlighted existing shortcomings of the system governing the responsibility-allocation for asylum-seekers in...

This paper uses the prisoner's dilemma game to explain why the financial services industry refuses to provide financial relief to homeowners even though the failure to provide meaningful relief has exacerbated the decline in home prices and has led to more foreclosures and losses for the industry

In der traditionellen Spieltheorie sind Strategien äquivalent mit Handlungen und gemischte Strategien die einzige Erweiterung dazu. Als eine neue Erweiterung werden Strategien als Pläne interpretiert. Obgleich die meisten Pläne nicht sehr interessant sind (wie eine bestimmte Handlung zu tun),...

We have studied the impact of time-dependent learning capacities of players in the framework of spatial prisoner's dilemma game. In our model, this capacity of players may decrease or increase in time after strategy adoption according to a step-like function. We investigated both possibilities...

Such problems as inner-city traffic congestion and pollution are often asserted to be examples of the n-person Prisoners` Dilemma Game (PD), but there is a dearth of empirical research that tests this assertion. 551 car owners in Oxford responded to three pairs of alternatives designed as...