The classic economic theory embedded in western democracies holds an assumption that human beings will almost always behave rationally in the end and make logical choices that will keep our society balanced on the whole. Daniel Kahneman is the psychologist who won the Nobel Prize in Economics for showing that this is simply not true. There’s something sobering — but also helpfully grounding — in speaking with this brilliant and humane scholar who explains why none of us is an equation that computes. As surely as we breathe, we will contradict ourselves and confound each other.