Preferences are defined over payoffs that are contingent on a finite number of states representing a horse race (Knightian uncertainty) and a roulette (objective risk). The class of scale-invariant (SI) ambiguity-averse preferences, in a broad sense, is uniquely characterized by a multiple-prior...

This paper illustrates the methodological and analytical issues that characterized, as well as the personal and institutional aspects that informed the discussions leading to the definition of the current notion of cardinal utility as utility unique up to positive linear transformations. As...

We show that all the fundamental properties of competitive equilibrium in Marshall's cardinal theory of value, as presented in Note XXI of the mathematical appendix to his Principles of Economics (1890), derive from the Strong Law of Demand. That is, existence, uniqueness, optimality, and global...

The paper illustrates the methodological and analytical issues that characterized, as well as the personal and institutional aspects that informed the discussions leading to the definition of the current notion of cardinal utility as utility unique up to positive linear transformations. As...

In this paper, we consider a portfolio optimization problem in a defaultable market. The representative investor dynamically allocates his or her wealth among the following securities: a perpetual defaultable bond, a money market account and a default-free risky asset. The optimal investment and...