Re:The expected value of the game is positive regardless of ...
by carlob on Friday September 06, 2024 @07:51AM
(#41465291)
Yeah but that utility function will not be a linear function of money so you can't say EV(u($$)) == u(EV($$)). This is the mathematical formulation that tells you that it is irrational to risk all your money to make an extra dollar even if u(EV($$)) is positive EV(u($$)) can be negative.
There are standard arguments (e.g. the Von Neumann–Morgenstern utility theorem) that an agent with rational preferences, with remarkably weak definitions of the word “rational”, must have an utility function and a subjective probability function such that their behaviour is always governed by the EV of that utility with respect to that probability.