This is a huge topic, which I’ve personally devoted quite a bit of time to, and was what led Delton Chen to approach us about housing his Global 4C project. We also support the Common Good currency, and invite you to join us.
But don’t just take it from us. Here’s the master, Bernard Lietaer, in 2016, on Monneta.org, a German nonprofit founded by Margrit Kennedy as a professional network for information and education about complementary monetary systems. The network “shares the conviction that a variety of money systems would be more sustainable for people, the economy and nature than just one.”
And here’s Charles Eisenstein on money, also from the Monneta site: