The Jet.com founder joined Walmart in 2016 after it bought his startup and pushed the bricks-and-mortar giant to ramp up its online offerings.
Amazon and Walmart have found that for some goods, it is often cheaper to refund the purchase price and let customers keep the products.
Costco reported strong quarterly sales as homebound Americans continue to spend more on food, homegoods and fitness products during the pandemic.
U.S. retail spending edged higher last month despite the ongoing coronavirus pandemic as a surge in online shopping boosted sales, according to data from Mastercard.
Retail titans can capitalize on the pandemic-driven surge in e-commerce by revving up their online-advertising plans.