作为社会商品的各类产品,在激烈的市场竞争中“优胜劣汰”長人所共知的一条规律,但这只是某一个特定时期产品横向对比的结果。此外,产品还有自身的规律,即产生、发 As a variety of products for social goods, in the fierce market competition, a rule known by the “survival of the fittest” is known to the elderly, but this is only the result of the horizontal comparison of products in a specific period. In addition, the product has its own laws, ie