Re:Bank Run at Silicon Valley Bank
by amluto on Friday March 10, 2023 @08:56AM
(#35094322)
There’s duration in the sense of borrowing short and lending long, and there’s duration in the sense of taking on the corresponding interest rate risk. The US model of fixed-rate mortgages is a bit of an oddity — banks will often lend long with adjustable-rate instruments.
If a bank has $100 of deposits and has lent out $90 on a 30-year adjustable rate basis, the bank is exposed to potentially liquidity issues, default risk, and second-order effects like changes in the yield curve. But if the bank lends that $90 as a fixed rate mortgage or buys a 30-year T bond, they are directly exposed to interest rate changes.
(Also, as I understand it, and this is far outside my expertise: banks usually try repackage their debt and sell it to investors. The banks presumably can’t carry those 30 year fixed mortgages on their books without accounting for interest rate risk. Why are T bonds special?)
If a bank has $100 of deposits and has lent out $90 on a 30-year adjustable rate basis, the bank is exposed to potentially liquidity issues, default risk, and second-order effects like changes in the yield curve. But if the bank lends that $90 as a fixed rate mortgage or buys a 30-year T bond, they are directly exposed to interest rate changes.
(Also, as I understand it, and this is far outside my expertise: banks usually try repackage their debt and sell it to investors. The banks presumably can’t carry those 30 year fixed mortgages on their books without accounting for interest rate risk. Why are T bonds special?)