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A QUESTION ABOUT MICROECONOMY

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A QUESTION ABOUT MICROECONOMY
(c)7.Which of the following market structures,where the use of advertising and brand names are the key marketing method?
(A)Competitive market
(B)monopoly
(C)monopolistic competition
what I want to know is why the answer A is not the correct answer,and what is the differences between answer A and answer c
The degree of competitive depands on what?THANK YOU VERY MUCH
嗯.用汉语可以吧?
A为竞争性市场,C为垄断性竞争.
题目要求为广告和品牌是市场营销的主要办法,在竞争性市场里面,企业厂家很分散的,竞争太过于分散和激烈,顾客完全可以用其他相似产品进行替代;比如纽扣之类的,属于生产厂家特别多,产品差异小的市场;而垄断性竞争里面,比如饮料里面的可口可乐和百事这两家,就需要广告很多和品牌效应.
不在于竞争有多少,而在于市场里面顾客的流动性和对产品的可替代度有多大.
个人之见~