Fluctuating prices usually base on a fickle public's demand.

物价的波动往往是由于群众需求的不稳定而引起的.

《现代英汉综合大词典》

Because of fluctuating prices, some makers are often their needs in order to manipulate the results.

因为股价的上下波动, 往往是一些庄家为了其需要而操纵的结果.

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