Genetics are a tenuous base on which to base capitalist dogma.
I suggest that you read the works of Richard Dawkins, starting with "The Selfish Gene" - should your personally selected divine revealer of Truth with a direct connection up to the bearded guy in the clouds allow you. HUMOUR ALERT.
Also, just to make it perfectly clear, the term "selfish" is used in a very specific, non-usual manner in "The Selfish Gene". Greed-is-good, free market, laisez faire capitalism is not backed up by Biology as nature's way.
Free markets are not a corollary of genetics. (no economic, philosophical, religious or political theories are)
Specifically, Ch. 12