The following commentary comes from an independent investor or market observer as part of TheStreet's guest contributor program, which is separate from the company's news coverage.BEIJING ( TheStreet) -- Shares of Amazon.com ( AMZN) slid as much as 10% in afterhours trading following its release of disappointing fourth-quarter results on Tuesday. The AMZN selloff led shares of Ecommerce China DangDang ( DANG) to fall by 3% to 4% in afterhours, after it was already down by more than 10% during the regular trading session. The question for investors is: what conclusions about DANG can we draw from AMZN. DANG is often referred to as "The Amazon of China." I have frequently disagreed with this label because ecommerce in China is not dominated by one behemoth like AMZN, but instead is split between a number of substantial competitors. DANG probably ranks about third or fourth based on traffic and revenue (coming in behind such non-listed names as Taobao and 360Buy.com). The reason that Wall Street refers to DANG as the Amazon of China is that we don't really have any other U.S.-listed alternative, so we are stuck playing with the third- or fourth-place player. In the competitive world of ecommerce, there is likely to be no prize for coming in fourth.