This paper studies the problem of screening teams either moral or altruistic agents, in a setting where agents choose whether not to exert effort order achieve high output for principal. I show that there exists no separating equilibrium menu contracts induces reveal their types unless principal (i) excludes one group from productive relationship, (ii) demands different efforts preference group...

one of the key human characteristics is our willingness to help others in need. As adults we do this routinely, often in the absence of immediate personal gain and occasionally even at great costs to ourselves. Proponents of a Hobbesian worldview argue that these helpful behaviors mainly depend upon the acquisition of social norms that override and control our pervasive selfish nature. It is of...

SPITE AND ALTRUISM IN GULLS In recent years, a controversy has developed in evolutionary biology concerning the existence of altruistic behavior in species other than Homo sapiens if true altruism is proven to exist, Darwin's (1859) theory of natural selection would be inadequate to account for all of evolution. This is because Darwin assumed that individual organisms should always act in their...

Altruistic behaviour is disadvantageous for the individual while is advantageous for its group. If the target of the selection is the individual, one would expect the selection process to lead to populations formed by wholly homogeneous groups, made up of either altruistic or egoistic individuals, where the winning choice depends on the balance beetwen group advantage and individual disadvantag...

Research in Behavioral Economics and Social Psychology, as well as recent experiments in Experimental Economics, provides evidence that in environments in which decision-makers’ are interdependent, people care about the outcomes of the others as well as their own one. Among the cases in which this happens, particular attention is being paid for those types of social preferences that can be incl...

In recent years, we have witnessed a progressive decrease in the number of cadaveric donors. 1 This fact, together with the rapid development of laparoscopic surgery in Urology, has enhanced the living donor in kidney transplantation programs now accounting for 12% of all transplants performed in Spain. 2 Overall, the grafts from living donors have an average life longer than the cadaveric ones...

In a local interaction model agents play bilateral prisoners’ dilemmas with their immediate neighbors and have three possible strategies: altruistic, egoistic, partial cooperation. After each period the adopt strategy highest average payoff in observed neighborhood. There does not exist an absorbing state which partially cooperative coexists any of other strategies. The limits diffusion altruis...