An American reader was puzzled by the fact that in Ankh-Morpork the unit of currency is the dollar, instead of, for instance, something more British, like the pound. Terry explained:
"The dollar is quite an elderly unit of currency, from the German ‘thaler’, I believe, and the use of the term for the unit of currency isn’t restricted to the US. I just needed a nice easy monetary unit and didn’t want to opt for the ‘gold pieces’ cliché. Sure, I live in the UK, but I haven’t a clue what the appropriate unit of currency is for a city in a world on the back of a turtle:-)…"