Of course, there is such a thing as money that really and truly *can't* be counterfeited. Elements such as gold, or other rare commodities, for example, cannot be faked; something either is gold, or it isn't. Also, useful objects and consumables in general cannot be faked; something either is useful, or it isn't.
Of course gold can be counterfeited - ask Archimedes. Or look up iron disulfide (FeS2, known also as iron pyrite or fool's gold) - it'll require pretty close inspection to be distinguished from actual gold. And this close inspection will also suffice to distinguish actual money from counterfeited money, so I don't think there's much sense to what you're saying, unless I'm misunderstanding it.
Personally, with the rise of biometrics, I'd put my money (pun intended) on two-tier-authenticated - something you are and something you know - payment systems taking over for regular money in most day-to-day transactions.
Cheers, Ivan.
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