Mixture sets were introduced by Herstein and Milnor (1953) into decision theory, where they are still widely used. This note clarifies the formal connection between mixture sets and convex sets. The results suggest that the former concept might be unnecessary for decision- theoretic purposes.

L'article discute de la sante de l'economie normative en distinguant les differentes conceptions repandues a cet egard parme les economistes, conceptions qu'il s'efforce de rattacher a leurs sources philosophiques -essentiellement, le positivisme dnas ses multiples versions et la philosophie...