A philosophy that bases ethical behavior on the opinions of relevant other people is called "relativism" or more specifically "ethical relativism" or "moral relativism." Relativism holds that moral judgments and ethical behavior depend on the norms, perspectives, or opinions of particular cultures or groups of people rather than universal or objective standards. In this view, what is considered ethical is relative to the beliefs and opinions of the relevant others in a given social or cultural context.

Explanation of Ethical Relativism

Ethical relativism posits that moral principles are not absolute but instead vary based on cultural or individual opinions. It emphasizes tolerance for diverse moral beliefs, acknowledging that different societies or groups may have conflicting ethical viewpoints that are all, to some extent, valid within their own contexts.

Distinction from Other Philosophies

• Ethical relativism differs from universalism, which asserts that there are universal moral standards applicable to all people regardless of context.
• It contrasts with ethical theories that rely on objective criteria independent of social opinion, such as utilitarianism or Kantian ethics.

Thus, the philosophy that bases ethical behavior on opinions of relevant others is best described as ethical relativism or moral relativism.