Zhang Yong, COO of Taobao.com, talked about the general market environment of online shopping in China, business of Taobao, its challenges and strategies in an interview with Knowledge@Wharton website. According to Zhang, After five years of development, [Taobao's] trading volume had reached RMB 43.3 billion (US$5.6 billion) in 2007. For the first half of this year, the number is RMB 41 billion, which is close to the annual volume last year. Basically, if you look at the growth rate over the last several years, it almost doubled every year: RMB 8 billion for 2005, RMB 18 billion for 2006, RMB…