Derek Parfit demonstrated that agent-relative consequentialism generates inconsistent social rankings: two agents can each correctly judge a different outcome as best, producing contradictory moral verdicts.

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Derek Parfit(as a philosopher being cited for his theory on personal identity): A highly influential philosopher who argued that personal identity (what makes you 'you' over time) is less important than we think, and that we're not the unified, continuous selves we assume we are.
Inconsistent social rankings(as the problem Parfit identified): A situation where two different judgments about what's best contradict each other—you can't say both are true at the same time without creating a logical problem.
Moral verdicts(as the contradictory conclusions produced by the theory): Definitive judgments or conclusions about what is morally right or wrong in a given situation.
agent-relative consequentialism(Introduced as a response to transplant-type counterexamples to standard consequentialism): A version of consequentialism holding that an act is morally wrong if and only if the act's consequences include less overall value from the perspective of the agent performing the act.

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