We develop an evolutionary approach to explain altruistic preferences. Given their preferences, individuals interact rationally with each other. By comparing the success of players with different preferences, we investigate whether evolution favors altruistic or selfish attitudes. The outcome depends on whether the individuals' interactions are strategic complements or substitutes. Altruism and...

A model of multiparticle production in hadronic collisions at ultra-relativistic energies, based on the assumption of independent string fragmentation, reproduces the rapidity spectra of Λ and Λ̄ in sulphur-sulphur collisions reported by the NA35 Collaboration. This is achieved after a reconsideration of the intermediate multi-string states and the structure of the diquarks. Nuclear stopping pow...

Our research is a variant of the third party punishment game. In particular, we want to test whether players have heterogeneous preferences; the levels of the sanction and of the transfer are proportional to the unfairness of the Dictator; the change of the role influences the Observer’s reaction to unfair behavior; players’ decision to punish the Dictator and/or to help the Receiver depends on...

A model of multiparticle production in hadronic collisions at ultra-relativistic energies, based on the assumption of independent string fragmentation, reproduces the rapidity spectra of Λ and Λ̄ in sulphur-sulphur collisions reported by the NA35 Collaboration. This is achieved after a reconsideration of the intermediate multi-string states and the structure of the diquarks. Nuclear stopping pow...

it is an increased interest in the therapeutic potential of cannabis sativa l. (marijuana) for treatment of multiple sclerosis and hiv neuropathy. because of limitation in cultivation of this plant, an efficient hairy root induction system for cannabis sativa l. was developed in the present study. agrobacterium rhizogenes mediated transformation performed by two different co-cultivation mediums...

Geographic Proximity, Trade and International Conflict/Cooperation This paper examines the interactive effect of distance and trade on international conflict and cooperation. The effect of geographic distance depends on trade, while the effect of trade varies with geographic distance. Trade reduces conflict to a greater extent when dyads are geographically close, but has a greater effect on coo...

This paper examines repeatedly implementing a social choice function in a general complete information environment where agents are in…nitely-lived and their preferences are determined stochastically in each period. We …rst demonstrate a necessary role that e¢ ciency plays for repeated implementation. We then establish how any e¢ cient social choice function can be repeatedly implemented in Nas...