There is an area. If you live in there, you need many things.
If other your companion produce things these necessary in the area, this area doesn’t need to get from others. So no outgoing money.
In the other hand, the area’s products can sell to other area, Money will come into this area. It will be saved in this area.
Then it will be investment for this area.
But…
What if you need more things from outside…?
Money in this area is going out.
…
If you need to store money, you must keep it in your area.
If you need to store things/material, you must keep the things/material in your area.
…
It is easy,,,
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