Carlos-
... velocity also allows or improves the capacity of repaying previously issued / borrowed loans, but only if the aggregate amount of loans keeps increasing. If the opposite occurs, then deposits keep getting extinguished and at some point (which I have no idea when that is, but I´m sure there is one), velocity alone cannot allow the repayment of principal and interest.
Yeah, I agree, they are both important, and that at some point, velocity alone cannot support repayment of P&I. My sense is, the ability to repay debt roughly follows the equation:
debt-payment-ability = velocity x money supply
If too many bank-credit defaults happen, money supply shrinks. If people get too scared, velocity shrinks. If both happen at the same time, its multiplicative, and we're back to Great Depression-land. And as you say, there's probably a minimum amount of money supply, below which things get really iffy. Base money helps to cushion that, and these days base money is not a small number. I used to think that if we paid down (or defaulted upon) all the bank credit, money would be gone. But that's just not true. Base money remains.
... only a bank or equivalent (credit card company for eg.) can issue legal tender IOU´s = currency. You and I cannot and this is, I believe, the key difference.
Sure, that is a key difference. Borrowing money from a bank increases the money supply. Borrowing money from a friend leaves money supply unchanged. And that brings up the following question:
In view of the equation I described above, is repaying a friend easier or harder (from the system perspective) than repaying a bank loan?
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Borrow $100 from a friend. Money supply is unchanged. Repay Friend $110. Money supply unchanged.
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Borrow $100 from a bank. Money supply +$100. Repay bank $110. Money supply -100.
In this simple example, it would appear that repayment in case 2) should be easier, if the equation I stated at the top holds true. Bigger money supply makes repayment easier, and that only happens in the bank-credit money case.
In both cases, you must make an interest payment. Both interest payments are equally hard. But the principal payment in case #2 is easier than in case #1. [The side effect is, case #2 is more inflationary. Easier repayment, but the cost is a more inflationary economy.]
But if they had allowed for all the bad debt to be defaulted upon, there would be massive losses for bank depositors and well.. I guess I don't need to expand much on the effects of something like this happening on a massive and global scale...
Surely true. From where we are right now, the cleansing will be quite the event.
But my claim is, if the Fed had let the cleansing happen way back when the "ponzi loan" defaults would have been relatively small (say, back in 1960), then it would have been like falling off a footstool. Worst you get is an ankle sprain. Now, after 50 years of interest rate interventions, it will be like falling off the top of a tall building.
Our goose is pretty well cooked at this point. This whole discussion is really much more theoretical - "who should we blame, and what should we do next time" - versus any sort of immediate cure for where we are now.
Should we blame "not creating enough money to pay the interest"? Or should we blame the Fed's "well-intentioned" interest rate interventions that short-circuited the default cycle? Clearly I think its the latter.