KnowraRoy's identityLinked fromLinked fromThe 3 pages that link to Roy's identity, each with the reason it gives.All 3Related 1Compared with 2Envelope theoremRelated: It uses the envelope property of utility maximization to recover demand.Shephard's lemmaCompared with: It recovers consumer demand from an indirect value function rather than firm cost.Hotelling's lemmaCompared with: Roy's identity is the consumer-side counterpart to deriving choices from an optimized value function.