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Historically there have been many countries / communities that have used local currencies and private issues of money to enable spending.

https://en.m.wikipedia.org/wiki/Local_currency

This was especially common during times of economic hardships: wars and famines. Ex. Russian revolution, the pogroms. Things used were food vouchers, lottery tickets, checks and obligations all sorts of things.

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To add to that there's a large interest from currency collectors.

Some interesting issues were money in Jewish ghettos / concentration camps during wwii

Do you have some links I could read up on, or was this just the set up to a poor joke?

Absolutely not a joke... http://www.jewishvirtuallibrary.org/jsource/Holocaust/money....

If you are interested/live in NYC there is a library with a ton of research materials on currencies/ history from all over the world at the American Numismatic Society's library: http://numismatics.org/Library/Library

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