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,燈下白頭人。2023 Prentice Hall Estimating Future Demand ? Survey of Buyers’ Intentions ? Composite of Sales Force Opinion ? Expert Opinion ? Past Sales Analysis ? Market Test Method 169。2023 Prentice Hall Demand Market Demand Company Demand 169。2023 Prentice Hall SecondaryData Sources ? Internal Sources ? Government Publications ? Periodicals and Books ? Commercial Data ? OnLine ?Associations ?Business Information 169。2023 Prentice Hall A marketing information system (MIS) consists of people, equipment, and procedures to gather, sort, analyze, evaluate, and distribute needed, timely, and accurate information to mark