Dopemin, at least in the context of what sinvestigating here, is really more about the wanting system. It's essentially that when we have certain experiences, it can stimulate parts of the brain that make us motivated to do that thing again. So to go back to garrybecker, if garry becker wants to say, hey, you look at an addict and you just are seeing his revealed preferences, that's what he wants. But i think what economists are now going to have to wrestle with: The very notion of utility in economics is the things that you like.