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Okay, then why did you say "either it is a unit or it isn't"?

By definition all units are standard, they cannot fluctuate, ever or it will invalidate all other measurements before them.

Saying it is a measure of length and also length itself is a contradiction. Saying it measures commodities and is a commodity is a contradiction.

I am not explaining it right maybe. Please go read the Bounded Input Bounded Output currency model, it will explain it better than me I think.

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