Write an essay on whether human beings are naturally selfish

Write an essay in response to the following prompt:

In this essay, which you will revise later into your final essay assignment, I would like you to think about one of the most foundational questions in ethics—whether human beings are naturally selfish (i.e., psychological egoists), naturally altruistic (i.e., ethical creatures), or whether circumstance is primarily responsible for these tendencies in a culture.