Eagle
The Amazing Flying Tuna Can
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Banks are known for taking money out of economy, like a leech, and as money does not turn so fast into salaries, they reduce liquidity.
I'll mull that over a little. It may be instead that banks actually enable liquidity. They keep a certain amount of capital in reserve that is available to (almost) anyone in relatively short notice as either a loan or withdrawal.
Yes the bank takes a percentage of almost every transaction. It is their incentive for doing business. However in real life, businesses pay their shareholders their profit, its not all even Steven to their employees. For this reason (and that this model economy is self contained) the money has to go somewhere, and since there's only 10 people, I'll suppose total bank interest = total loan interest.
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After sleeping on the problem I have a few thoughts on externalities I've been trying to justify. If our economy is completely self contained then no externalities can exist and the value of money is only a % of total production. Otherwise there are many many more factors to consider; such as fixed costs or minimum prices in production.
If there is a minimum consumption each person must use is annother factor. Are they making, trading (and then burning) decorative knicknacks, or are they turning a crank to produce oxygen in a spacecraft?