Or, like, I order the quail dish with my phone, or use my phone to let it be known that I would be interested in quail dishes costing less than $15 or something

Or, like, I order the quail dish with my phone, or use my phone to let it be known that I would be interested in quail dishes costing less than $15 or something, and you'd do the same for oysters. That demand and potential demand would then be aggregated with everyone else's by the big central computer, which would calculate a price based upon the supply capacity and cost of production (including how those costs are affected by other demands in the economy). That price determination occurs organically in a free market, but it's not perfectly efficient and involves a lot of redundancy and waste. With sufficient computational power it might be possible to formalize that process and make it more efficient.