My friend in the US walks into her local foodstore, takes several items from the shelves - and leaves with them in her bag, without interacting with anyone.
Her credit card (of which the store has details) is automatically debited - and she receives a itemised list via the internet.
When initially registering for the service, she was provided with a fob which activates when she enters - verifying who she is. And the items taken are recorded by in-store wi-fi.
Impersonal now enters retail...