An approach we examined over the years in many forms. In aisle checkout. Recently took a close-up look at how Kroger was testing this idea with a handheld device. The Sainsbury test will also include store item location and a shopping list.
In Gizmag:
" ... No-one likes spending any longer at the supermarket than they have to. Whilst self-service checkouts may have sped things up a touch, one UK supermarket is now set to trial doing away with checkouts altogether. The new Sainsbury's app lets users scan items at the shelf and pay via their smartphone. .. "
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