Amazon (AMZN) said Wednesday that it is now offering same-day grocery delivery in more than 2,300 U.S. cities and towns, making good on an expansion plan revealed this summer. Amazon stock was higher while shares of online-grocery rivals Instacart parent Maplebear (CART) and DoorDash (DASH) fell. The tech behemoth pledged to expand to more markets next year. Moreover, Amazon said…
