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> (Yes, this is a gross over-simplification) This isn't really an over-simplification as it is wrong. When someone deposits $1m in the bank, the bank's assets increase by $1m in cash, while liabilities also increase by $1m and owners' equity is unaffected. The problem is that for interest-bearing deposit accounts, those liabilities increase over time, which decreases owners' equity in the absence of a sufficiently appreciating asset (such as a good loan or cash flow-generating security). Further, the bank has certain operational costs that must be paid, and investors must make some return or they'll pull capital from the bank (that's a simplification for publicly traded banks like SVB). In practice, it seems that banks need about 3 percentage points above the interest rate they pay on deposits to cover these costs, based on the typical spread between the Prime rate and the Federal Funds rate, though I imagine this necessary yield has a much higher variance for smaller banks. When interest rates were effectively zero and their deposits increased by a huge amount, SVB decided to buy long-term bonds w/ 1.5% interest to cover the extra liability over time so that assets would grow with liabilities. Then interest rates went up. Cash assets stopped growing, but liabilities remained the same, so they started selling their bonds. Bonds lose value when interest rates increase, so their bonds sold for a loss, decreasing asset values. In the last 48 hours, depositors got spooked. SVB's equity effectively went negative, since asset values decreased below outstanding liabilities. That's typically when the FDIC steps in to liquidate a bank. For banks, assets must in general be growing faster than liabilities. If the bank experiences a situation where assets are not growing relative to liabilities, they need to have sufficient capitalization (i.e. owners' equity) to weather the storm. |