The $$\kappa$$ -universalization of a symmetric game is the in which each player considers that any other chooses with probability same stategy as she. To normal form game, we associate two-stage which, first stage, roles to be played base are randomly assigned. We show pure strategy equilibrium this extended an by altruistic players (“ex ante Homo Moralis altruistic”), and converse false. pape...

Altruism was originally defi ned as a cooperative act infl icting a cost to the donor and only giving a benefi t to the recipient. However, no study has ever conclusively demonstrated the existence of altruistic behaviours that do not give any short-or long-term benefi ts to donors. Th erefore, the term altruism is generally used for costly behaviours that may potentially also be benefi cial fo...

The Price of Warm Glow This paper presents a model and experimental evidence to explain the “volunteering puzzle" where agents prefer volunteering time to donating money when monetary donations are, ceteris paribus, more efficient for providing resources to charity. In the model agents receive heterogeneous utility from pure and impure altruism (Andreoni 1989) that permits warm glow to vary bet...

In order for non-kin altruism to evolve, altruists must receive fitness benefits for their actions that outweigh the costs. Several researchers have suggested that altruism is a costly signal of desirable qualities, such that it could have evolved by sexual selection. In two studies, we show that altruism is broadly linked with mating success. In Study 1, participants who scored higher on a sel...

Biological explanations are given of three main uninterpreted theoretical results on the selection of altruism in inelastic viscous homogeneous populations, namely that non-overlapping generations hinder the evolution of altruism, fecundity effects are more conducive to altruism than survival effects, and one demographic regime (so-called death-birth) permits altruism whereas another (so-called...