Kroger is set to offer a click-and-collection option at 10 Michigan stores by the end of 2016. ClickList, the brand's e-grocery service with curbside pickup, launched at one store in December and expanded to a second store this week.

Dick Boer, the chief executive officer of Ahold, which has 3,000 stores, mostly supermarkets, across Europe and the United States, says the internet has vastly changed retail and the grocery business.