Saving for lean times is a survival instinct and almost as important as the need to reproduce, but when does it turn into greed? Maybe that Wall Street greed isn’t human nature.
When sex energy gets into the parts of the brain that do the math and numbers does that need for satisfaction create a need for more, bigger, faster?
In this short you-tube vid (
http://youtu.be/HnrfuTUlqVs ) an alien explains that most humans have sex-on-the-wrong-brain but some just have it worse.
Maybe greed came with civilization, when it became necessary to delay the age of reproduction. Maybe the real purpose of sexual repression, whether intended by our traditional power structures or not, is to make sure we never talk about which hand to masturbate with. That way we always choose the default hand, the sword and hammer hand, the hand connected to the side of the brain that is satisfied with more, bigger, faster.