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Thanks, and I did read that a few years back, will re-read.
I guess, looking from a perspective of wanting higher housing security and less mortgage volatility in the UK, additional insurance and protection of deposits or other ways of reducing the possibility of bank runs could then assist a move toward longer term fixed mortgages.
Anyway, I’ll stop derailing the thread now. Thanks for your responses.
I think this is where it's important to distinguish between the system as a whole and any individual bank. At the system-level, yes, duration mismatch does not exist because loans and deposits are always in balance (as they mutually create and destroy each other). However, any individual bank is still at risk of bank runs if all of the depositors decide to move their money to another bank.
https://www.bankofengland.co.uk/-/media/boe/files/quarterly-bulletin/2014/money-creation-in-the-modern-economy