Digital influence is a measure of internet research's effect on offline retail sales, and this forecast highlights the effects of retailers' cross-channel selling efforts. By 2022, we expect the internet to influence 41% of in-store sales during customers' purchase journey. This forecast calculates digital-influenced sales across 30 retail categories, with historical data going back to 2004. This report also includes a top-line forecast on mobile-phone-influenced sales, showing the percentage of offline retail that mobile phone research influences.