Vagueness and Decision
A rejoinder to Professor Roberts' denial that vagueness of opinion plays an important role in violations of the Savage axioms. It is pointed out that Roberts' own remarks would seem to indicate the importance of vagueness.
Ellsberg, Daniel, Vagueness and Decision: A Rejoinder. Santa Monica, CA: RAND Corporation, 1963. https://www.rand.org/pubs/papers/P2705.html. Also available in print form.
Ellsberg, Daniel, Vagueness and Decision: A Rejoinder, Santa Monica, Calif.: RAND Corporation, P-2705, 1963. As of June 15, 2021: https://www.rand.org/pubs/papers/P2705.html