Ever read Adam Smith? I have. Smith's economic theory of "self-interest" worked great up until the development of the mature money economy. In other words--not for very long. It was originally based on the idea that the rich landowner would naturally distribute his goods among his tenants, or else risk the material wealth going to waste. After all, he could only personally benefit from a small portion of it. Today's wealth is more effectively locked up in abstractions that offer the potential for eternal, useless hoarding. As Georg Simmel's vision of the purely abstract money economy came to fruition, the power of Smith's "Invisible Hand" to benevolently and naturally distribute wealth was destroyed.
How about Adam Smith's other revolutionary theory? You know, the one that claims our moral system is based on fellow-feeling; something he called "sympathy"? Maybe we ought to try that one now.
Of course, the way you interpret "sympathy" is what varies, but I am pretty sure that, for the majority of humans, sympathy is fairly narrowly defined.
Pick your model of human behavior, say it is so, and we'll mostly go along with it.