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专业市场在我国的普遍发展,说明有其存在的合理性。当一种商品具有较多花色品种时,就会给消费者带来花色效用。当一个专业市场只卖一种或几种商品、同时拥有较多花色时,花色效用就会弥补消费者到较远的市场所付出的路费。一个专业市场,当其专业化带来的消费者消费占收入比例的减少少于因此而扩大的市场半径带来的消费者数量的增加时,它就比同等规模的非专业市场更为优越,因而可以扩大其市场半径,直到两者相等为止。因而专业市场的存在是有效率的,其分布受上述成本收益规则的支配。
The general development of the professional market in our country shows the existence of its rationality. When a product has more color varieties, it will give consumers the color effect. When a professional market sells only one or a few products and has more suits at the same time, the effect of color will make up for the toll that consumers pay to farther markets. A specialist market is superior to a comparable market of non-specialist markets when its professionalization results in less than a fraction of the income share of consumer spending as the resulting increase in the number of consumers resulting from the enlarged market size, Thus it is possible to expand its market reach until the two are equal. Thus the existence of a professional market is efficient and its distribution is governed by the above-mentioned rules of cost-benefit.