Following a strong Black Friday and Cyber Monday, both Walmart and Amazon reported record-breaking sales, with their platforms seeing growth from third-party sellers.Walmart reported record sales for its third-party Marketplace during the early holiday shopping season, with the period from Nov. 25 to Dec. 2, including Cyber Monday, marking its highest-ever sales day and conversion rate. The company highlighted growth in its eCommerce business, with overall sales up 22% in the most recent quarter, with Marke ...