Money in an interstellar civilization, for inter star system trade at least, will have to be commodity based. Even electronic transactions would take years, possibly centuries to complete, during which time fiat currency could lose the vast majority of its initial value.
Paul Krugman (!) has actually addressed this formally (!!) http://www.standupeconomist.com/pdf/misc/interstellar.pdf …
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True story, Krugman got into econ because he wanted to be a psychohistorian from Foundation and Empire
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