Re: Money in a closed ecosystem

I think that the term "growing" was misunderstood - it refers to a certain floral activity, and I'll bet that there's not export, it's all consumed internally.

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Growing, however, creates real value that would need to be balanced with external cash inflow (a very useful indicator of how much is being grown, BTW.)

I disagree. While the total value of the system compared to the external world can indeed grow (and be balanced by an outflow of some saleable resource, either physical or not) the amount of needed in-circulation cash is going to be pretty close to constant, if you can disregard inflation.