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In a key scene in the classic Frank Capra film "It's a Wonderful Life," George Bailey (played by a noble, sincere James Stewart), faced with a run on his family-owned bank, tries to convince his friends and neighbors that their money is safe, even though he cannot meet their demands of mass withdrawals. He tries to explain that "the money isn't here in the safe," but has allowed the citizens of Bedford Falls to build homes and finance their needs at a reasonable price. If the evil, grasping Old Man Potter (played by a sneering Lionel Barrymore) is allowed to take over the bank, he warns, "There will never be another decent home built in this town."
At first, he gets nowhere. The deposits are not insured and those who have mobbed the bank, although they like George personally, are terrified the bank will run out of money and they will be left with nothing. George, pleading with them to listen, is forced to pay out cash to a couple of the depositors who remain unmoved. But soon his pleas begin to sway the men and women he has known all his life and who have been doing business with the bank since his father began it. The demand for withdrawals ceases, the bank is saved, and Potter is foiled.
In the end, there was only one thing that could have convinced the frightened, skeptical townsfolk to change their minds.
Trust.
That is the way banking works. It is, at its core, a fragile system. No bank could ever meet a demand for total withdrawals by even a fraction of its customers because the money has either been loaned out or invested. Insured deposits have changed the equation somewhat, as has federal oversight, but, as Silicon Valley Bank found out, the principle remains sound. Bedford Falls Savings and Loan survived and Silicon Valley Bank failed because although SVB's balance sheet was technically sound, it had lost the trust of many of its largest depositors.
Banking is not the only institution whose assets are ephemeral and that cannot function without trust.