You are confidently incorrect on this. Currency == money. Money is, for we hoi polloi, a barely consentual conversion and exchange system for our labor, hypothetically allowing us to convert our labor into readily fungible exchange units. Money, at the Capital Class level, is debt, and therefore control, i.e. power. Money is just how they keep score.

There are plenty of barter gifting and Communist (“from those of ability to those of need”) economies, just on scales that fly below the radar of most economists. Your sweeping assertion leads me to believe that you may simply be ignorant of those non-monetary exchanges. Would you be willing to add more context to your assertion?

Edit: I misspoke; crashfrog raises a valid point, and I meant gift economies.