The document compares and contrasts e-commerce in China and the United States. It finds that while China's e-commerce market is growing rapidly at 400% annually, the more established US market currently generates more total e-commerce revenue. Both countries see e-commerce as an important driver of economic growth. China uniquely promotes large online shopping days and has a highly developed mobile commerce sector, while the US provides more government support for digital trade. Looking ahead, the document predicts that global online retail will grow to $1.4 trillion by 2015 and $4.2 trillion by 2020.