We give in this paper a formal definition of the concept of weak and strong a-polarization. We give necessary and sufficient conditions for a decision maker who respects the Lorenz order and who behaves in accordance with the expected utility model, with Yaari's dual model or with the...

Les mesures traditionnelles des inegalites considerent l'aversion collective a l'egard des inegalites comme un parametre determine a priori. En particulier, ce parametre est maintenu constant lorsqu'on effectue des comparaisons internationales ou intertemporelles. Nous proposons ici d'utiliser...

In a seminal paper, Kolm [14] introduces the principle diminishing transfer. This principle requires that a transfert from an individual with income x to one with income x - D(D 0) has a greater impact on social welfare the lower x is. On the other hand Mehran [15] and Kakwani [11] introduced...

The purpose of this note is to build an ethical inequality index which explicitely takes into account the social attitude towards inequlaity, through the actual tax scheme. We give a rough empirical application of this subjective inequality index to the evolution of wage inequality in France...