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"Science fiction writers, I am sorry to say, really do not know anything. We can't talk about science, because our knowledge of it is limited and unofficial, and usually our fiction is dreadful."
- Philip K. Dick

Credit  
  A basic unit of currency.  

This familiar currency unit, the "dollar" of the future, was Campbell's idea.

Right enough, and tell me why I have to build that five-million credit flying laboratory.
From The Mightiest Machine, by John W. Campbell.
Published by Astounding Science-Fiction in 1934
Additional resources -

Compare to the more elaborate truffle skins from Philip K. Dick's 1965 novel The Three Stigmata of Palmer Eldritch. Also, take a look at the wide variety of alien currencies in the comments to this story on a New Space Currency.

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Additional resources:
  More Ideas and Technology from The Mightiest Machine
  More Ideas and Technology by John W. Campbell
  Tech news articles related to The Mightiest Machine
  Tech news articles related to works by John W. Campbell

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