You probably lost the ability to recognize a bad deal before you got into kindergarten. This experiment shows that they’re able to emotionally understand when hard work has earned something that’s not worth having—but it turns out in this instance, four-year-olds are wiser than six=year-olds.
Why don't doomsday cults break up when their apocalyptic predictions fail to come true? After all of that suffering and inconvenience, people want to make the best of a situation. And this same phenomenon will allow you to treat people like crap, and pay them a pittance — and they'll thank you.
Psychology has a reputation for being the science of common sense, or a field that simply confirms things we already know about ourselves.