Here was an interesting article, If the state can’t save us, we need a licence to print our own money. The case for a local currency is the same as the case for a national currency: Monetary policy can adjust to local conditions to help local markets. But the determents of a local currency, like exchange rate spreads, and local economic collapse, are greater than the benefits. A currency should have sufficient economic output to back it, otherwise it will become useless. Aggregate economies are less likely to fail, if only because of statistical stability.
What I find most interesting is
…should issue their own currency. To discourage people from hoarding it, they should impose a fee (called demurrage), which has the same effect as negative interest. The back of each banknote would contain 12 boxes. For the note to remain valid, the owner had to buy a stamp every month and stick it in one of the boxes.
I like the idea that currency should reduce in value over time if not maintained, just like all other human-made assets. This has the benefit of taxing the rich on their cash assets with out the detrimental effects of inflation. Money should be used a medium for exchange, not used as an asset itself.
Now, I am against the fractional reserve system of banking: I would prefer the state to issue all currency directly; adjusting the amount as needed to maintain a stable exchange rate with other countries.
With that in mind, local banks borrow money from the central bank at an interest rate, which may be the very same “demurrage” mentioned before. All banks must pay the demurrage held in their accounts (costs forwarded to account holders of course), all paper money should also be designed to expire (so to prevent hording of paper money).
I have not thought this all through.