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0 pointsAeolun3y ago0 comments

Since they can loan out much more than they get in deposits that’s not strictly true right? You can have 10 house loans for every house sized deposit (or something similar).

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Danieru3y ago

You are confused about how fractional reserve works.

The 10x multiplier is on the bank's equity. For every dollar of home loan there is a dollar or more of deposits.

The multiplier effect of fraction reserve occurs over iterated loans and depositing. The fraction term comes in because the bank can lend out a fraction, less than 1, of deposits.

terragon3y ago

This is incorrect. Fractional reserve lending means that they can keep a fraction of deposits as reserve and loan out the rest. This necessarily means they are not fully covered in times of large withdrawals.

Danieru3y ago

Sorry, you are not getting what OP was confused about.

The OP thought 10dollar of loans existed for every 1dollar of deposits. That is what I address. Instead for every say 9 dollars of loans there exists 10dollars of deposits.

You are agreeing with me. The outstanding loans are/should never be greater in value than the outstanding deposits. Aka: they should be a sub 1.0 fraction. Of course the fraction reserve aspect is the inverse ratio, itself also below 1.0.

jrockway3y ago

Yup. A bank run is problematic because if you keep 99% of the money but 100% of your customers want cash today, then you're screwed.

hnfong3y ago

The more modern treatment of this situation is that if you sold the mortgage on the open market as a mortgage backed security you might still be solvent as long as the MBS is valued at least at face value.

The real problem with failing banks is that interest rates rose steeply, and thus the MBS devalued by a significant amount.

mikeryan3y ago

I don't know where that 10x number is from but they can loan more then they take in by taking out lower interest rate loans from central banks. Thats what "The Fed" is.

But they're going to use depositor funds first because these days those funds are available at a virtually 0% rate.

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Danieru3y ago

You are confused about how fractional reserve works.

The 10x multiplier is on the bank's equity. For every dollar of home loan there is a dollar or more of deposits.

The multiplier effect of fraction reserve occurs over iterated loans and depositing. The fraction term comes in because the bank can lend out a fraction, less than 1, of deposits.

terragon3y ago

Danieru3y ago

Sorry, you are not getting what OP was confused about.

The OP thought 10dollar of loans existed for every 1dollar of deposits. That is what I address. Instead for every say 9 dollars of loans there exists 10dollars of deposits.

jrockway3y ago

Yup. A bank run is problematic because if you keep 99% of the money but 100% of your customers want cash today, then you're screwed.

hnfong3y ago

The real problem with failing banks is that interest rates rose steeply, and thus the MBS devalued by a significant amount.

mikeryan3y ago

I don't know where that 10x number is from but they can loan more then they take in by taking out lower interest rate loans from central banks. Thats what "The Fed" is.

But they're going to use depositor funds first because these days those funds are available at a virtually 0% rate.

j / k navigate · click thread line to collapse