So they say!
But what if you drop a tenner on a busy street, and then wait politely while everyone walks past, until there is a sufficiently people-less space for you to bend down and retrieve your tenner, so that you don’t get in anyone’s way during the process of retrieval, during which time (which, if you are in London or New York or Tokyo or Berlin, during rush hour, may be a matter of hours) someone else has noticed your tenner and shoved everyone else out of the way to nab it for themselves, or said tenner has become so trampled upon that its state of defacement and general tattiness have caused it to become “non-legal tender”?
Then your politeness has cost you a tenner!
