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adj. Not exchangeable.

adj. used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value

adj. not suitable to be exchanged

"Thus, so much of every product as is rendered by excessive abundance inconsumable, becomes useless, valueless, unexchangeable, -- consequently, unfit to be given in payment for any thing whatever, and is no longer a product."

irredeemable    incommutable   

unchangeable