摘要
The rapid growth of Internet users in recent years transformed the Internet into an important tool in achieving business growth and market development(Zhao et al.,2016).In 2016,the number of Internet users worldwide reached 3 billion;the total Internet economy of G20reached 4.2 trillion USD,which is higher than the GDP of Germany,the world’s fifth largest economy(Dean et al.,2012).With the rise and development of a new
基金
supported by the National Natural Science Foundation of China (Grant No.71390524)
