A self-driving Nuro vehicle parks outside a Fry's supermarket, which is owned by Kroger, as part of a pilot program for grocery deliveries Thursday, Aug. 16, 2018, in Scottsdale, Ariz. Kroger Co. has chosen the Phoenix suburb as a test market for delivering groceries using driverless cars. The Toyota Prius will be used for the deliveries, manned by a human to monitor its performance. During phase two in the fall, deliveries will be made by a completely autonomous vehicle, called an R1, with no human aboard. (AP Photo/Ross D. Franklin)

The logo for Rite Aid is displayed above a trading post on the floor of the New York Stock Exchange, Thursday, Aug. 9, 2018. Rite Aid and the grocer Albertsons called off an agreement to become a single company with the deal facing shaky prospects in a shareholder vote.(AP Photo/Richard Drew)

Rainbows are seen over Frankfurt, Germany, late Tuesday, July 31, 2018. (AP Photo/Michael Probst)

In this July 19, 2018, photo, a U.S. postal carrier delivers Amazon orders to an apartment complex in downtown Pittsburgh. Amazon's quarterly profit soared past $2 billion for the first time, as revenue from online shopping and its cloud computing business grew. (AP Photo/Gene J. Puskar)

In this Jan. 23, 2013 photo, trailers line up at the loading docks at the Supervalu distribution center in Hopkins, Minn. United Natural Foods is buying Supervalu for $1.26 billion, creating a grocery food wholesaler with a diverse customer base. United Natural Foods of Providence, R.I., said Thursday, July 26, 2018, it's paying $32.50 per share in cash, or a premium of 67 percent, for each share of Supervalu Inc. Including the assumption of debt, the deal is valued at nearly $3 billion. (David Joles/Star Tribune via AP)

In this Tuesday, July 17, 2018 photo, a FedEx employee delivers packages in Miami. Amazon Prime Day was launched July 16 and and will be six hours longer than last year's and will launch new products. (AP Photo/Lynne Sladky)

FILE - In this Feb. 8, 2018, file photo, Amazon Prime Now bags full of groceries are loaded for delivery by a part-time worker outside a Whole Foods store in Cincinnati. Amazon’s Prime Day deals are coming to the aisles of Whole Foods, as the online retailer seeks to lure more people to its Prime membership after recently hiking up the price. (AP Photo/John Minchillo, File)

FILE - In this April 17, 2013 file photo, cars drive past a Tesco store in west London. British supermarket chain Tesco and France's Carrefour are creating a strategic alliance to give them more clout with global suppliers. The companies say in a statement Monday, July 2, 2018, that the three-year deal will cover their relationship with suppliers and include joint purchasing of the stores' own-brand goods.(AP Photo/Alastair Grant)

FILE- In this Feb. 22, 2018, file photo, a shopper loads her car after shopping at a Walmart in Pittsburgh. Walmart Inc. reports earnings on Thursday, May 17, 2018. (AP Photo/Gene J. Puskar, File)