E-commerce in the U.S. is expected to account for 8% of total retail sales this year, on the way to a 10% share by 2017, according to Forrester, with mobile one of the key factors driving growth. The 13% year-to-year growth in 2013 and a 10% compound annual growth rate after that "will be abetted by traditional stores' investments in Web businesses to support a multichannel strategy, the blistering pace of mobile device adoption and the fact that consumers are more comfortable with purchasing online," analyst Sucharita Mulpuru writes.

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