I’d like to introduce the concept of Infomoney by Franz Hörman.
It is not based on mutual credit but focuses on wealth in living systems by taking a different approach in matching demand and supply.
In particular, the matching is based on asymmetric pricing in which the different price functions for demand and supply are accounted for - independently.
Especially for (Holo)REA, I think this aids the distribution function nicely when there is no need for symmetric exchange of goods like overproduction of food for instance.
Curious what you think about it and if there is interest for an hApp implementation of the idea.
Most references are in german, however here are some details described in english as well.