在生产技术日益先进，企业规模日益增大，商品种类大为增长的今天，消费者已有充分的余地来选择适合自己需要的商品，过去由生产者决定市场供需的“卖方市场”已开始转变为消费者决定市场供需的“买方市场”。企业所面临的问题，已不再是如何推销已经生产的商品，而是如何事先 With the increasingly advanced production technology, the ever-increasing scale of enterprises and the substantial growth of commodity types, consumers have sufficient room to choose the commodities that suit their needs. The “seller’s market”, which used to determine the market supply and demand by producers, has begun to change The “buyer’s market” that determines the supply and demand of the market for consumers. The problems faced by enterprises are no longer how to sell the products already produced, but how to advance