A funny thing I've experienced here in the US is how the cash register systems at Fred Meyer and QFC (two large food store chains which apparently have the same owner). Most stores have offers where you get a discount when you buy more than one item (2 for $5 or $3 each). The funny thing about Fred Meyer and QFC is that you get the discount even if you buy only one item. So obviously their cash register software does not handle "group discounts" or they do not know how to configure it. Or it is a hidden feature which benefits the observant shopper. Either way; I like it.