Envisaged by BernardLietaer

  • GlobalReferenceCurrency
  • MultinationalTradingCurrencies
  • NationalCurrencies
  • LocalComplementaryCurrencies

RichardDouthwaite on the same tip : http://www.feasta.org/documents/moneyecology/index.htm

In 2021, see also CurrencyGearBox

Of course, all this was thought about long before we had BlockChains. But some of the ways of ScalingBlockChains with layer 2 chains seems similar. And maybe, by the same token (see what I did there?), you might try to implement this kind of gearbox, the way multi-layer blockchains work.