Altruism can be understood in a behavioral or in a psychological sense. Motivationally, altruism is the desire to enhance the welfare of others at a net welfare loss to oneself. Behaviorally, altruism is any act that could have resulted from altruistic motivations. The economic literature shows...

Most economic models are based on the self-interest hypothesis that assumes that material self-interest exclusively motivates all people. Experimental economists have gathered overwhelming evidence in recent years, however, that systematically refutes the self-interest hypothesis, suggesting...

Reciprocity is one of the main basic social relations that constitute societies. It consists of being favourable to others because others are favourable to you (and not from an exchange in the strict sense). It rests on three possible rationales: (1) balance (comparison, matching), often related...

We consider abstract social systems of private property, made of n individuals endowed with non-paternalistic interdependent preferences, who interact through exchanges on competitive markets and Pareto-efficient lumpsum transfers. The transfers follow from a distributive liberal social contract...

La bienveillance est la vertu humaniste par excellence. D?importantes théories de la justice « sous le voile d?ignorance », issues des principaux courants de l?éthique humaniste des Lumières, excluent la bienveillance de la liste des raisons et motifs individuels sur lesquels elles...

The recent era of economic turbulence has generated a growing enthusiasm for an increase in new and original economic insights based around the concepts of reciprocity and social enterprise. This stimulating and thought-provoking Handbook not only encourages and supports this growth, but also...

Most organ transplants are from dead donors. National transplant organizations exhibit considerable differences in terms of their donor population rates. Spain’s organization is by far the most efficient in this respect. We argue that much of the productivity advantage of Spain’s transplant...

I consider an abstract social system made of individual owners endowed with nonpaternalistic interdependent preferences, who interact by means of individual gifts and by exchanges on competitive markets. The existence of equilibrium is established. I identify the set of allocations that are...

I consider abstract social systems where the distribution of wealth is an object of common concern. I study, in particular, the systems where liberal distributive social contracts consist of the Pareto-efficient distributions that are unanimously preferred to the initial distribution. I define a...