Droogs":1camm6ae said:curbing how much people buy in any particular chin is not hard at all. Nearly every bus company in Scotland currently does it as they have chip readers on the bus and a central finance system which only charges your card up to a specific point so you only pay for the equivalent of a day ticket even though you have to present it each time. Easy enough to allow the card to be used once and only once per supermarket chain per day/week etc.
Between me and my partner we have 7 credit/debit cards plus cash. Within 3 miles we have approx 20 full size supermarkets.