This new Smart Cart from Amazon can reduce the post shopping time needed for billing and check out, saving lot of standing in queue time.

Well this in their US Stores on a pilot basis!

Maybe some day we may have such solutions in our Supermarket chains, where Billing time is more than the shopping time typically on weekends and festive seasons with another irritant - Card swiping machines don't work or are made not to work for cash sales to happen.