Lack of Change

Argentina has a lack of change (coins and small bills). Almost every transaction is rounded and occasionally people will add another item to your order so that they don't have to make change. If you are buying a few pieces of small candy you might end up with an extra piece and the seller will round up to the nearest peso.

This has been true in Buenos Aires, Mendoza and Bariloche. It is an added bonus when you receive an extra pastry or sweet.