The Nature and Scope of Managerial Economic (Sifat dan Ruang Lingkup Ekonomi Manajerial). Demand Estimation: Marketing Research Approaches. ΓÇóConsumer Surveys ΓÇóObservational Research ΓÇóConsumer Clinics ΓÇóMarket Experiments ΓÇóVirtual Shopping ΓÇóVirtual Management