We saw already how a set of symbols that gain sufficient meaning to a community becomes a cultural system, and so to are the pieces of the market part of the system as well. Thus the currency, and more importantly the rules of the marketplace for the currency become part of the cultural system itself.
In computing systems, we have a lot of parameters to play around with. For example, if the currency can be procured through the smashing of pots that respawn periodically, or the solving of some algorithmic puzzle, it allows for market behavior that isn't possible in the physical world.
Similarly we can play around with the result of transactions. Perhaps instead of being exchangeable, units of currency are expendable. This tends to be the case for social transactions like bring food to a potluck.
Unlike the physical world where cultural systems and their marketplaces are usually geographically based, digital cultural systems and their marketplaces can go worldwide. Their boundaries are marked by the computers who run the software that conforms to the rules of their marketplace, and people are free to enter and exit at will.
This left me with the question, "do I build a way of connecting the marketplaces between different cultural systems, or do I build a marketplace for a specific cultural system?" Being a programmer first with no regard for the feasibility of delivering to market, I did both.
Turns out people are really territorial about folks coming into their cultural system. But taking the marketplace to a cultural system that needs one. That's Planet Nine's First Experiment.