Read Andrew H. West's great article, A Stern Opinion: MBA Students, Aristotle, and Ethics. Here is a paragraph from the article in the Opportunity magazine (NYU Stern School of Business):
"I would suggest that the road to ethical recovery involves changing the common approach to ethics among businessmen. One of history's greatest philosophers, Aristotle, took an entirely different approach to ethics, which philosophers call "egoistic eudaemonism." Aristotle said that the purpose of ethics was to help you, personally, to achieve happiness and a successful life, and that your virtuous behavior was what got you there. In his system, virtue involved not sacrificing your interests, but pursuing them. Virtues got you "goodies" in life. Of course Aristotle took a very rational approach to what was truly in one's interests and what happiness is."