This paper provides evidence on how Keynes devised a mathematical framework for his system of probability, which he called «approximation», in A Treatise on Probability, 1921. Keynes used standard conditional, mathematical probability to duplicate Boole’s results in the Challenge problem. He...

This paper reconstructs how Keynes managed to formally develop the concept of aggregate supply in chapter 20 of the General Theory. As a preamble, the first section recaps Don Patinkin’s long struggle to devise the correct expression for the so-called Z curve while, at the same time, he...

In 1922, F.Y. Edgeworth asked the readers of the world’s leading philosophy journal Mind for help in analyzing Keynes’s conventional coefficient of risk and weight, c. Keynes had created the first decision rule in history that generalized the linear and additive expected value and expected...

The operational definitions of uncertainty used by John M. Keynes and Frank H. Knight are based on missing information that will not be available to the decision maker at any time. The founder of this approach is George Boole. This leads to indeterminate interval probabilities. The definition of...