The Difference Between System One and System Two

There's a difference between the process by which we make decisions and how we describe those decisions to people. That example you just mentioned, GED, of how finance professionals internally use the one-over-end heuristic but then talk about something different to their clients seems to be an illustration of the element of truth in Kahneman's infamous system one versus system two distinction. "We are not gaining anything by making, by reducing everything to two words," says Professor Evans.