This article proposes an interpretation of the chapters of the Nicomachean Ethics concerning exchange and friendship. Rejecting approaches where Aristotle anticipates modern labour or need-based theories of value, the article claims that those notions of labour and need are required for a satisfactory interpretation of the most obscure passages of Book V. Finally, Aristotle's texts on exchange and friendship are related in such a way that the latter, since it is free from any political considerations, allows us to better understand the philosopher's view on exchange.

A quick survey of the literature reveals that authors disagree as to which sentiments are moral and which are not, they disagee as to how to distinguish between moral and other sentiments, and finally that often the same author will claim a sentiment is moral at some times but not at others. These difficulties arise, I argue, from an underlying concept of emotion that I call atomism. Viewing emotions as means of coordination among agents, rather than as psychic atoms, suggests a radically different approach to the question of morality and affects, one where emotions pave the way for normative expectations.

In 1983, in an open letter to the journal Nature, Karl Popper and David Miller set forth a particularly strong critical argument which sought to demonstrate the impossibility of inductive probability. Since its publication the argument has faced many criticisms and we argue in this article that they do not reach their objectives. We will first reconstruct the demonstration made by Popper and Miller in their initial article and then try to evaluate the main arguments against it. Although it is possible to conceptualize logically the idea of induction, it is shown that it is not possible on traditional Bayesian grounds.