Ethical solipsism

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Ethical solipsism is a form of personal morality that holds that no other moral judgement exists or matters apart from one's own individual moral judgement. It is related to ethical egoism but with the difference that the ethical egoist thinks that individuals should abide by the morality of social order to the extent that it is in their own self-interest to do so.

Due to the solipsistic uncertainty regarding the existence of external beings, it is possible for the ethical solipsist to adhere to external moral standards, for other beings may be real and conscious.