What System 1 does for us is to provide us with a repertoire of biases, biases that reduce the decision-making load on our conscious brains. These biases aren’t infallible, but they provide what Kahneman calls useful “heuristics”: they’re right often enough that it makes sense to follow them and not to try to override them without some good reason (say, if you’re someone whose calling in life is to help homeless people).
