单伟建还明确的质疑：在工资和原材料价格双双上涨的情况下，利润率如何才能增长得如此之快？

But surely Mr Shan has a point: how can profit margins increase when wages and raw material prices have been rising so rapidly?

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“每周都有人向我们兜售首次公开上市(IPO)之前的交易，”单伟建表示。

"Every week, people pitch pre-IPO [initial public offering] deals to us," says Mr Shan.

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单伟建曾在位于费城的宾夕法尼亚大学沃顿商学院担任教授，他说：“我们不像许多同行那样在追踪泡沫。”

"We are not chasing bubbles as many of our peers do," said Mr. Shan, a former professor at the Wharton School of the University of Pennsylvania in Philadelphia.

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