Quasi-Separable Preferences (formerly: Conditionally Additive Utility Representations) Advances in economic theory have made decision theoretic models increasingly complex. Utility functions often lack additive separability, which is a major obstacle for decision theoretic axiomatizations. We address this challenge by providing a representation theorem for utility functions of quasi-separable preferences of the form (u(x,y,z)=f(x,z) + g(y,z)) on…