Effective market Hypothesis ignores the effect of market microstructure on asset pricing and price variation.

有效市场理论忽略了市场机制等市场微观结构因素在定价和价格变化方面所起的作用。

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Follow up chemical market price variation and quality condition in order to improve product quality and reduce purchase cost;

及时跟踪掌握化学品市场价格行情变化及品质情况，以提升产品品质及降低采购成本；

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The price variation of admission tickets to world heritages is a hot topic in the fundamental research and the social practice in recent years.

世界遗产门票价格变动是近几年理论研究和社会实践的热点问题。

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"We will look at whether price variation clauses are appropriate at all, " said an Ofcom spokeswoman.

BBC: Mobile phones: Ofcom studies mid-contract price rises

The desire is also substantiated by real estate prices for urban residential space, which are 40 to 200 percent higher than in traditional suburban neighborhoods -- this price variation can be found both in cities and small communities equipped with walkable infrastructure, he said.

CNN: Is America's suburban dream collapsing into a nightmare?

Food director of British Retail Consortium, Andrew Opie said that there is "a variation in price between those in the top quarter of dairy production and those who aren't and farmers who are lucky are those in supermarket supply chains".

BBC: Milk price: Who's to blame?