While online retail sales continue to grow, the impact of the Web on overall retail is much larger. With the proliferation of smartphones, the large installed base of tablets, and general cross-shopping behavior, the Web will influence over 50% of total US retail sales, and will continue to grow at 7% compound annual growth rate (CAGR) through 2018. The Forrester Research Web-Influenced Retail Sales Forecast details growth across 30 product categories and historical data going back to 2004.