Here's another possibility: a centralized (even globalized--but not 'panoptic') currency that would be self-regulating. It can be thought of as a kind of permanent ‘quantitative easing’, but with built-in safeguards against inflation.

The amount created would be determined by demographics (only). To close the 'monetary loop' there would have to be a limit (based on income) on how much money could be hoarded, but the amount of money that exceeded that limit and got collected would be determined only by the decisions of all of the individual entities in the economy, not any single person, committee, or organization. A self-regulating supply of currency would make the economy self-regulating.