This document discusses the relationship between ethics and business. It argues that ethics are now a part of business law, as seen in regulations like Sarbanes-Oxley that require directors to sign ethics declarations. While business and ethics may seem incompatible if profit is considered unethical, the document explains that societies are built on cooperation, which ethics support. It then reviews perspectives on ethics from various cultures and eras. The document concludes by discussing long-termism in business and providing Warren Buffett's rule of thumb for ethical conduct.