I guess it was on the old site (or maybe all the way back on HF) where I had started a thread on this subject, but I have talked about it tangentially in other threads over the years. Ron Paul used to introduce legislation session after session for a competing currencies bill. You can find details on it here: Ron Paul's competing currencies bill
I remember discussing the issue with @Bozo_Casanova and others, but it was all abstract or theoretical. Now there is a real world case of it in