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I have serious doubt about "killing a lot of low end business". I'd imagine that we'd start seeing lots of alternate, local currencies. Card games and bets would probably have other medium of exchange (poker chips) or in-kind value (a 12-pack of beer).

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Probably. Hell, we could all just start using Euros (or whatever) for cash, and then exchange our Euros for plastic-only US dollars at changing booths (which would suddenly become a lot more common).

This, of course, doesn't make life any easier for anyone, except the jerks who already use cards for everything (aka the jerks I always get stuck behind in line while I wait for their little receipt to print and get signed).

You want to stop using hard currency so that you can use a different hard currency? Additionally, the Fed(s) aren't fond of competing currencies.

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