https://www.cnbc.com/2018/01/17/coming-to-a-grocery-store-near-you-self-driving-carts-smart-shelves.html

U.S. grocers are playing catch up.

Held back by razor-thin profit margins, which have made investing difficult, grocery retailers have lagged behind their peers in Europe and parts of Asia in making strides with technology that reduces the time shoppers spend navigating aisles, ringing up purchase and bagging items.