The Nonidentity Problem (article)

This entry examines choices that influence who exists and the challenge they pose for person-affecting accounts of harm. Cases involving resource depletion and other identity-changing decisions show why an outcome can appear wrong even when those who exist would not have existed under the alternative.

The crucial condition is that the alternative choice changes which individual comes into existence. If the same person would exist with better conditions, ordinary comparative harm applies more directly. The identity-changing case instead asks what is wrong with leaving a person in preventably poor conditions when their alternative is nonexistence. Maintaining that distinction is essential: otherwise an apparently simple solution may answer a different problem from the one the article sets out.

Follow the construction of the problem before comparing solutions. In each case, ask whether the same person exists in both outcomes, whether their life is worth living, and what alleged wrong remains. Keep comparative harm separate from a requirement to provide acceptable conditions.

Ask whether a response explains the wrong through rights, noncomparative harm, or impersonal value, and which additional cases it can handle. A solution should not suggest that the resulting people have lesser worth. The puzzle concerns the justification of choices, not a demand that anyone regret being alive.

Sketch an original pair of fictional development plans that lead to different future populations. Assume both sets of people have worthwhile lives but inherit different infrastructure. Ask whether a decent-inheritance requirement could explain the objection to the worse plan. Then state what makes that standard defensible and how it weighs present burdens. The exercise evaluates a possible response without implying lesser worth for the people who exist or asking them to regret their existence.