Everybody is Selfish

It is not yet another Ayn Rand type argument that selfishness is a virtue. I am saying that a person can not be unselfish. Every person takes the decision that makes him more happy. e.g. There is no such thing as sacrifice. A person sacrifices because he would be less happy if he doesn't. Similarly, a person works for others only because he becomes more happy by working for others than working for himself. To conclude, I would say that any option has by default alternative of not choosing that option; a person chooses an option because not choosing that option makes him less happy.