This Q4 update to the US online retail sales forecast maintains the original sales projections. Computers, software, music, books, and videos will see the slowest online growth over the next five years. The fastest online category growth will come from pet products, garden supplies, art and collectibles, consumer electronics, and sports equipment. This forecast details growth across 31 product categories, with historical data going back to 1998; it also calculates the share of online retail sales for each product category.