A.I. is helping holiday shoppers empty their wallets at an unprecedented pace. U.S. consumers spent a record $11.8 billion online this Black Friday, according to Adobe Analytics, and are expected to shell out another $14.2 billion on Cyber Monday. Driving this shopping frenzy is a growing reliance on A.I. systems to recommend gifts, track prices and place orders. Shoppers are especially turning to chatbots to research products and hunt for deals.