浙江省三门县有个养殖青蟹的农民,从前去上海卖螃蟹,都是不分螃蟹大小,统统运到上海。然而上海人“喜大厌小”,大螃蟹卖掉了小螃蟹却没人要,最后只能把小螃蟹运回来。这样不但多花了运费,而且时间稍长,小螃蟹就会死在运输途中。吃了这个亏,他就进行了市场调查,发现问题不是出在 Sanmen County, Zhejiang Province, there is a farmer farming crabs, past to sell crabs in Shanghai, are regardless of crab size, all shipped to Shanghai. However, people in Shanghai, “Hi big tired little”, crabs sold little crabs but no one wanted, and finally only the small crabs shipped back. This will not only take more shipping costs, but a little longer, small crabs will die in transit. Ate this loss, he conducted a market survey and found that the problem is not there