New Welfare Economics and Social Choice Theory have given rise to a group of problems which lie on the frontier between Economic Theory and Ethics. The attempts to deal with these problems have generated a literature known as «on Ethics and Economics». The analytical developments of concepts like utility, preferences or well-being and notions like meta-preferences, agency or commitment (Sen) all connect directly to the ethical dimension that any Theory of Value presupposes. In relation with the Theory of Choice, concepts like rationality, consistent election and selfinterest impede the accommodation of behaviors like altruism or others whose consequences do not affect directly to the acting agent. The perceived difficulty to link ethical aspects of actions with standard Economic Theory allows us to qualify the relationship between Economics and Ethics as one of mere juxtaposition
