Six Billion Shoppers: The Companies Winning the Global E-Commerce Boom by Porter Erisman is a book that I have underlined generously. This book is an interesting look into e-commerce in various continents. Great comparisons along with reasons for different companies and their working principle. You will learn a lot about Alibaba, ebay, Taobao, Tmall, Tokopedia, Flipkart, Snapdeal and their founders.
You even venture into Europe to find out about what Rocket Ventures does.
It answered questions like what buying a Seiko watch in US meant for my dad, why Amazon chose Seattle and many more all things related to ecommerce.