产品生命周期是指企业产品从进入市场到退出市场的全过程。第一阶段市场引入期（或称市场介绍期），是指产品投入市场测试的阶段。产品处于这一阶段的主要特点是：生产批量小，制造成本高，推销费用大。企业通常无利可图！但这是为了将采取得利润作准备。第二阶段——市场成长 The product life cycle refers to the entire process of the product from entering the market to exiting the market. The first phase of the market introduction period (or market introduction period) refers to the stage when the product is put into market testing. The main characteristics of the product at this stage are: small production volume, high manufacturing costs, and large marketing costs. Businesses are usually not profitable! But this is to prepare for profit. Phase II - Market Growth