How are the stock market and quantum mechanics related?

From a Lex Fridman interview with theoretical physicist Lisa Randall.

“Stocks may not achieve a precise value until they’re traded, but that doesn’t mean we can’t approximate their worth until they change hands. Similarly, electrons might not have definite properties, but they do exist. It’s true that the electron doesn’t exist as a classical object with definite position until the position is measured. But something was there – which physicists use a wave function to describe.”