Complete characterization of Yannelis—Zame and Chichilnisky—Kalman—Mas-Colell properness conditions on preferences for separable concave functions defined inL + p andL p

Summary Properness of preferences are useful for proving existences of an equilibrium and of supporting prices in Banach Lattices. In this paper we characterize completely properness and uniform properness for separable concave functions defined inL ₊ ^p . We prove also that every separable concave function which is well-defined inL ^p is automatically continuous.The author would like to thank Rose-Anne DANA and three referees for their helpful remarks and suggestions.