Amazon Will Dominate 50% of All United States E-Commerce by 2021

As Fortune reports, Amazon is currently on its way to becoming the source of 50% of all United States e-commerce sales. The online retail giant is expected to hit the 50% mark by 2021, largely due to the success of the Prime membership service and the Marketplace program. "Amazon is still outpacing the overall industry's growth, extending its lead over rivals," writes Phil Wahba. At present time, Amazon accounts for 34% of online sales in the United States. With Amazon's dominance of the U.S e-c...