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starting in 1913 with the Federal Reserve Board,
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so your notes that you see are called Federal Reserve Notes.
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Banks still are vulnerable to bank runs
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because they still have deposits,
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so the system is still vulnerable and, therefore,
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the Federal reserve has a set of reserve requirements.
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Now the reserve requirement is progressive.
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Small banks have lower reserve requirements
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but it rapidly gets up to a standard.
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The reserve requirement now is 10% on demand deposits,
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so they're forced to keep those reserves
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and much of that is in the form of deposits