Cross-border B2C e-commerce will more than double over the next five years to reach $424 billion by 2021. China will drive cross-border growth, and its share of the online cross-border market will grow from 27% in 2015 to 40% in 2021. Cross-border sales will take an increasing share of online commerce, rising from 12% in 2015 to 15% in 2021. This forecast considers the growth and drivers of cross-border commerce by country, and it also analyzes the major axes of cross-border trade worldwide across Asia Pacific, Europe, and North America. The forecast helps retailers understand what drives consumers to shop cross-border and how this may change over time. It details online cross-border B2C sales across 29 countries.