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At least in Portugal, prices on a supermarket can only be lowered during the day, never increased. The logic is: During a dynamic price increase, a customer may pick an item from the display at the low price, only then to be charged the higher price at the register; the store would be found lying on the displayed price, which is illegal.

This severely limits dynamic pricing.

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That's interesting. I worked in a supermarket as a student (in the UK) and was told when I asked (because I like to ask these sorts of questions) that here in the UK, the retailer is not obligated to honour the implied contract.

Essentially, if the price is wrong on the shelf, they can simply choose not to sell you the item if you refuse the correct price. In reality, larger stores won't want to upset a customer and generally will honour a lower price. It's more likely to happen when buying a loaf of bread than when buying a TV, or a car for example.

This is because people frequently try to scam stores by swapping labels and such.

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