I found this very interesting - Power Ledger
They are live, trading with various projects in Asia / Australia.
This video explains the concept - (10) BCPG & Power Ledger’s T77 Project in Bangkok, Thailand - YouTube
Would love something like this in the UK. I am paying ~15p down and will be selling back at ~5p. This would allow me to bargain with a neighbour to trade @ 10p - both of us benefit.