This paper documents an exchange between Leonard Savage, founder of the subjective probability approach to decision-making, and Karl Popper, advocate of the so-called propensity approach to probability, of which there is no knowledge in the literature on probability theory. Early in 1958, just...

Chapter 1. Introduction -- Chapter 2. The Art of Conjecture: Probability and Utility -- Chapter 3. Uncertainty According to Knight and Keynes -- Chapter 4. Von Neumann, Morgenstern and Decision-making under Risk -- Chapter 5. Ramsey, de Finetti and Savage: Decisions under Uncertainty -- Chapter...

On the occasion of the assessment of the enduring influence of Keynes’s Treatise on Probability at 100 years, this paper focuses on its relevance for decision theory. The paper places emphasis on Keynes’s introduction of the epistemic notion of probabilities that often are non-numerical, as...