[k-mcgrady]

>> Where are those social app systems that process your grocery receipts and show where the savings on things you buy are at the moment?

The major supermarkets in the UK did something like this (they might still do it). If you shopped online, after your order had been delivered you would receive an email telling you whether your shop would have been cheaper or more expensive at their biggest competitor and by how much. If your shop in Tesco for example worked out £3 more expensive than if you'd done the shop in ASDA they would refund you the difference or give you a coupon. The limitation was that it did not apply to own-brand items I believe.

The problem I think with a third party doing something like this is that it'll just lead to a price war. Supermarkets are able to squeeze their suppliers pretty hard and while you might save 10p on your milk some local farmer ends up totally screwed with no bargaining position.