KnowraShephard's lemmaLinked fromLinked fromThe 4 pages that link to Shephard's lemma, each with the reason it gives.All 4Related 2Compared with 2Production functionRelated: It links cost minimization based on production technology to observable input choices.Envelope theoremRelated: It is an envelope-theorem application to cost minimization.Hotelling's lemmaCompared with: The closely related cost-side identity emerged as duality methods developed.Roy's identityCompared with: It uses a parallel derivative method, but yields compensated rather than ordinary demand.