Abstract
Structural ethics is a research program examining moral possibility and obligation under resource constraints. It formalizes the mathematical structure of moral space, showing that classical ethical theories presuppose resource sufficiency and become undefined at or below critical feasibility thresholds. The program unifies three frameworks—feasibility (ZIC), sustainable duty (Enoughness), and measurable affection (Love)—into a single resource-indexed moral ontology. Together they reveal that morality, like physics, has structure: its boundaries, dynamics, and limits can be expressed in formal, testable terms. The result is an empirically grounded metaethics for resource-constrained moral life.