The $42 billion withdrawal on Thursday March 9 from SVB bank is the largest one day withdrawal in US banking history, over twice that of Washington Mutual when it collapsed in 2008, says this report in the WSJ. By concentrating on Silicon Valley, SVB bank went on a growth spree, but its concentration in the Valley proved to be its undoing. The optimism turned awry in 2021 with the decline in NASDAQ of 33%, and tech companies facing layoffs with more scrutiny from the government and the US Congress, efforts to breakup monopolies, the Fed chairman Powell's and president Biden's efforts to focus on the cost of living crisis.