That's a very smart idea. Like others have said I don't see it working in Canada, but realizing that people have wait times for the subway, and giving them something productive to do that saves in another aspect of their lives is great.
While grocery shopping probably wouldn't work here, it may be a good idea for other aspects of our shopping lives.
Pizza delivery, order Chinese, purchase electronics, download media, order a cab, all from a QR code on the side of a bus stop/LRT station/etc could be a great idea.
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