Final answer:
A manager who bases ethical behavior on the opinions and behaviors of others is operating within normative ethics, often aligning with principles such as relativism and pluralism.
Step-by-step explanation:
When a manager bases ethical behavior on the opinions and behaviors of relevant other people, the philosophy is best described utilising principles related to normative ethics, a field which involves the study of ethical action and emphasizes the roles of consequences, duties, and virtues in moral decision-making.
This approach is particularly aligned with ethical theories such as relativism and pluralism, which consider the variation of moral beliefs and values through different historical and cultural lenses. Normative ethical relativism, for instance, posits that ethical actions should be judged within the context of the prevailing moral norms of a particular society or group.