我在看英文版曼昆《经济学原理》，第四章 市场供求 课后习题最后一题时觉得有点困惑。原题是这样的：

An article in The New York Times described a succesful marketing campaign by the French champagne industry.

The article noted that "many executives felt giddy about the stratospheric prices. But they also feared that such sharp increase would cause demand to decline,which would then cause prices to plunge."

What mistake are the executives making in their analysis of the situation?

我理解原题意思是：

纽约时报的一篇文章提到法国香槟业的一次成功的市场营销活动，文章提到“许多高层对这一天价感到昏眩，但他们担心这么大幅的提价将会造成需求的减少，继而使（香槟）价格暴跌。

请指出这些高层在分析这一情况时的错误。

有高人帮我分析一下错在哪里吗？谢谢！