Daniel Kahneman

in the speed of walking between individuals.

And that's noise.

And people neglect noise.

And then there is something else, which touches on both philosophy and psychology.

When you have intuitions about things, there are clear intuitions and there are strong intuitions.

And not the same.

So a clear intuition is if I offer you a trip to Rome or a trip to Rome and an ice cream cone,

You know what you prefer.

It's easy.

But it's very weak, of course.

I mean, the amount of money you would pay to get a trip to Rome and a trip to Rome and an ice cream cone, nothing.

But when you are a philosopher, and I should add one thing, to see clear intuitions, you have to be in this kind of situation that psychologists call within subject, that you have both, you have both with the ice cream cone and without the ice cream cone.

So in a within-subject situation, that's an easy problem.

In a between-subject situation, it's an impossible problem.

But now if you're a philosopher, you're always in a within-subject situation.

But people live in a between-subject situation.

They live in one's condition.

And the same thing is true for psychologists.

So psychologists live in a, when they cook up their hypotheses, they're in a within-subject situation.

But then they make guesses about what will happen between subjects.