DoorDash agrees $17 billion deal to buy Instacart

DoorDash has agreed to buy grocery delivery platform Instacart in a $17 billion deal expected to close in about a year. The firms say Instacart shoppers will gain access to 150,000 stores, up from 100,000, while DoorDash will expand beyond restaurants into retail. DoorDash chief Tony Xu said it will tap Instacart's grocery and substitution expertise.