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A comment on Aldi, a brutally efficient grocery chain, is upending America's supermarkets. Parent comment
https://en.wikipedia.org/wiki/Smarte_Carte looks like it might be the airport system you have in mind.
The usual European shopping cart system works with a coin deposit, chains and mechanical locks on each cart, as described in several other comments.
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https://en.wikipedia.org/wiki/Smarte_Carte looks like it might be the airport system you have in mind.
The usual European shopping cart system works with a coin deposit, chains and mechanical locks on each cart, as described in several other comments.