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> The existence of credit itself is what causes monetary instability, and without credit the world would look very different.

Indeed. Credit is money; ultimately anyone can expand the money supply with an IOU.

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Money is destroyed when a loan is paid back. Private credit does not expand the monetary supply permanently. Only the state can increase the money supply.
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Your understanding of monetary theory is somewhere between 110 and 5,000 years off. Furness had a pretty cogent explanation of a monetary system without central authority or functional currency about 100 years ago with the Yap. They even managed to have bouts of inflation without the concept of a bank or state.
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You are neglecting interest paid. It doesn't matter who issues the credit - the Medici family or the US Federal Reserve.
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credit does provide a kind of flexibility that is sometimes needed, though. However, predatory lending, and the endless stacking of recursive loans, and government money printers are a massive stability issue that we're running into globally, and have (as you say) run into multiple times, historically.

My thought on this would be a dynamicaly stable currency. estimate debt and transaction activity, and the more debt and more liquid activity there is, the more deflationary currency should be. the less debt there is, and the less of a percentage of the money is actually in-use, the more inflationary the currency should be. this, though, is fairly off-the-cuff.

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