要欢迎变动的需求，即便是在开发的晚期也不例外。敏捷过程利用变更来为客户获得竞争优势。
Welcome changing requirements, even late in development. Agile processes harness change for the customer's competitive advantage.
按照阻塞程度、阻塞时间及变动的需求流量等已知条件，采用车流波动理论推算排队向上游延伸的最远距离。
A traffic flow wave theory is used to calculate queuing length according to different crowded level, crowded time and variant demand volume.
唯一不带来变动的价格就是p*，即能够使需求数量等于供给数量的均衡价格。
The only price which doesn’t lead to price changes is p*, the equilibrium price in which the quantity supplied equalsthe quantity demanded.
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