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a part of their liabilities as reserves,
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like the goldsmith banker only holding part of the gold,
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is a problem.
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The question is: how much reserves should a bank hold?
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Bank failures occur
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when there's not enough gold in the vault
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and then people start asking for the gold
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and the goldsmith banker doesn't have it to give out.
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The Basel Accord was in 1988
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and you can read about this in detail in Fabozzi, et al.
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It was an international convention that gave,
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what they called, risk-based capital requirements