Amazon accounts for more than 5% of global ecommerce revenues

"Amazon has done a lot more than become a stellar retailer. It has reinvented, disrupted, redefined, and renovated the global marketplace. Last year, e-commerce sales around the world surpassed $1 trillion for the first time; Amazon accounted for more than 5% of that volume. This seemingly inevitable shift has claimed plenty of victims, with more to come. Big-box retailers like Circuit City and Best Buy bore the brunt of Amazon's digital assault, while shopping-mall mainstays such as Sears and JCPenney have also seen sales tank. Malls in general, which once seemed to offer some shelter from the online pummeling, have been hollowed out."
Source:  FastCompany, 5th August, 2013