Humans are the only species on the planet that systematically exhibit selfless, cooperative behavior with non family members. Our notions of fairness likely hav

Humans are the only species on the planet that systematically exhibit selfless, cooperative behavior with non family members. Our notions of fairness likely have strong genetic components. Indeed, the genetic foundation for our conceptions of fairness almost certainly must have preceded our ability to consciously reflect on the meaning and implications of fairness. I say this because while philosophical and game theoretic models are interesting and informative, in the 21st century we really should be looking to our unique genetic evolution for better answers.