This is hard to answer because
1. I don’t exactly know how it will function.
2. It will loosely be based on gift economy values.
What I am mostly confident of is the path towards such an economy which will inevitably take us towards a new system and reveal it’s exact workings.
The path I have in mind is an application of an ancient meditation method called Vipassana to the economy. Basically in this meditation, the root cause of suffering is identified to be our cravings and aversions.
I think the economic system suffers from the same (Cravings for infinite growth).
When I apply it to economy I got this : Start zero-profit business in the food sector. And hence I have a plan document here if you’re interested:

Google Docs
The Vipassana Grocery Store
The Vipassana Grocery Store Introduction: The Economy is a Body We often treat the economy as a math problem, but let's think of it as a biological...