Adobe Analytics predicted Amazon consumers would spend $23.8 billion throughout the four-day event, $9.6 billion more than last year’s event, according to Forbes.

Adobe released initial one-day figures for the Amazon Prime Day event, with promotions happening broadly across U.S. retailers this week. Adobe forecasts U.S. retailers drove $7.9 billion in online spending on July 8,

Online spending is expected to surge to $23.8 billion across U.S. retailers during a 96-hour Amazon Prime Day event this week, according to an Adobe Analytics forecast released on Monday, as shoppers seek strong discounts on back-to-school gear ranging from apparel to electronics.