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I'll certainly buy all 19th century $10 gold coins for $20 a pop.

Well, theoretically it's tough for it to get much below $1 for any extended period of time, correct?

If it goes too far below then witnesses will probably put the APR interest rate back up as an incentive to buy and people will start converting it to steem and sell that. So yeah it shouldn't go too far below for an extended amount of time.