We would evaluate the strategy of player i as unkind if the kindness function is negative as the kindness function of player i is negative only when she is sacrificing her own material payoffs to decrease the material payoffs of player j.
For the monopolistic case, by (22) it is straightforward to check that, for (upsilon < frac{1}{2}), an increase in (upsilon ) increases the odds and commissions, and decreases the bettors' payoffs as well as the bookmaker's payoff when (rho < 1).
When (mu_{{theta_{text{r}} }}) decreases, the warehouse's payoff decreases as well.
An agent is spiteful (Levine, 1998 ), or competitive (Charness and Rabin, 2002 ), or status seeking or interested in relative income (Duesenberry, 1949 ), if her well-being decreases in the payoffs of others everywhere; so the core property of such preferences is positively sloped indifference curves in (m, o ) space.
The shorter payoff period decreases the net gain to migration; thus, it lowers the probability of migration (Borjas 2012).
This means that payoff bias decreases the frequency of altruists in every group unless groups are small enough or migration rates are low enough that there is enough relatedness within groups to create a compensating inclusive fitness benefit (or equivalently, maintain sufficient variation among groups so that there is sufficient between group selection in favor of altruists).
In principle, the PD is a very simple game where agents may behave as cooperators or as defectors, then in accordance with a payoff matrix, they increase or decrease their payoff when they face each other.
In this study, giving in AI condition reduces self-interest, increase others' payoff, decreases inequity, and increases efficiency (i.e., total reward), whereas taking in DI condition reduces self-interest, decrease others' payoff, decrease inequity, and decrease efficiency.
Similarly, individuals who spent more money to decrease others' payoff had less positive values than those spent less money.
