The only exception is when speed and time is critical relating to the service or good being purchased such as a Bus ride. There are now though exceptional cash machines that do make quick change Note that on the Euro notes there is nothing on it that I indicates legal tender. Hmm, this means you can make copies it without breaking laws. It also means that there is nobody that is required to accept it, Sure enough the Laws say they can be copied and at any time they can remove them as legal tender.