"The third assumption, and by far the most pernicious, is a behavioral model that describes human beings as something called "homo economicus," which basically means that we are all perfectly selfish, perfectly rational and relentlessly self-maximizing. But just ask yourselves, is it plausible that every single time for your entire life, when you did something nice for somebody else, all you were doing was maximizing your own utility? Is it plausible that when a soldier jumps on a grenade to defend fellow soldiers, they're just promoting their narrow self-interest? If you think that's nuts, contrary to any reasonable moral intuition, that's because it is and, according to the latest science, not true. But it is this behavioral model which is at the cold, cruel heart of neoliberal economics, and it is as morally corrosive as it is scientifically wrong because, if we accept at face value that humans are fundamentally selfish, and then we look around the world at all of the unambiguous prosperity in it, then it follows logically, then it must be true by definition, that billions of individual acts of selfishness magically transubstantiate into prosperity and the common good."