Despite Delivery Delays, Last Minute Shoppers Are Still Spending: Report A new report from NPD Group says retail sales growth during the week following Cyber Week was a welcomed reversal from this year's Black Friday and Cyber Monday results. December 22, 2020 Jelena Retail sales increased 3% in the week ending December 12 compared to the same week last year, and combined with the 9 prior weeks, holiday 2020 has shown 2% year-over-year dollar sales growth, reports The NPD Group.1 Additionally, NPD's early indicator data shows unit sales for the week declined -5% year over year. The continued divergence of dollar and unit comps is the result of higher-priced items being sold at retail and decreased promotional activity.