Demographics and demand: Evaluation of alternative functional forms

► Evaluates the role of functional form of demographics in demand analysis. ► Nests 'unstructured' and Barten-Gorman forms in GQL and other demand systems. ► Equivalence of 'unstructured' and Barten-Gorman forms cannot be rejected for GQL. ► Their equivalence is rejected for shape-invariant GQL, AIDS and marginally QUAIDS. ► Barten-Gorman form identifies more meaningful equivalence scales for QUAIDS, AIDS.