What separates human beings from other animals? What makes us distinct, different, unique, what traits do we alone have who have done things that no other species has on Earth? For that matter, what is different between a person hunting for subsistence and a person settling the Fertile Crescent?
Ayn Rand suggests that we are fundamentally selfish creatures, and that such selfishness is not a bad thing (we touched briefly on this in our Pride post). Her philosophy of objectivism argues that even an act of apparent charity is at its core a selfish act, a moral transaction of sorts - the recompense you receive for your "selfless" act on another's behalf is the sense of satisfaction or boost in reputation which you experience as a result.