Parfit's 'Triple Theory' argument demonstrates that contractualism, consequentialism, and Kantian ethics converge, suggesting wrongness-facts are not external to but partly constitutive of contractualist reasoning.

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Kantian ethics(as a theory of ethics): A moral philosophy based on Immanuel Kant's idea that actions are right when they follow universal moral rules (like 'don't lie'), regardless of whether they produce good outcomes.
Parfit: Derek Parfit was a highly influential British philosopher known for revolutionizing how we think about personal identity, morality, and what makes life worth living. He argued that our sense of being a continuous, unified "self" is partly an illusion, and that what really matters is the continuation of our thoughts and experiences, not some invisible thread connecting us through time. His ideas have shaped modern ethics and how philosophers approach questions about identity, responsibility, and how we should treat future generations.
Triple Theory(Parfit's alternative to Sidgwick's utilitarianism): Parfit's substantive ethical theory representing a convergence of rule consequentialism, Kantian universalizability, and Scanlonian contractualism
Wrongness-facts(as the key philosophical claim being discussed)

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