The U.S. and Europe are expected to see steady eCommerce growth. A report from Forrester is predicting 56 percent increased sales by 2021 in the U.S. as a direct result of mobile device use. Digital sales are expected to reach $523 billion by 2021; in 2015, sales were $335 billion. The report expects 26 million more eCommerce and digital shoppers by 2021.