These 5 key markets could help Amazon's international retail business explode (AMZN)

Over the last few years, Amazon has launched retail operations in many international markets as the e-commerce giant continues to expand its global footprint. 
According to RBC Capital Markets, these five countries could contribute more than $25 billion in sales to Amazon's retail business by 2023, and international retail growth could outstrip North America's by 2021. 
The analysis led RBC to raise its long-term forecast for Amazon's 2021 revenue by about $5 billion to $406 billion.&n