Template-Type: ReDIF-Paper 1.0 Title: Observability and optimality Author-Name: Geanakoplos,J.D. Author-Name: Polemarchakis,H.M. Author-WorkPlace-Name: Geanakoplos:Yale University Polemarchakis:Columbia University Keywords: Incomplete asset markets,Von Neumann-Morgenstern utility, Observability Series: Sonderforschungsbereich 303 Creation-Date: 1988-10 Handle: RePEc:bon:bonsfa:216