Why Did The Fed Inject Banks With A Record Amount Of "Other" Cash In The Past Week?

For all its obscurity, the Fed's balance sheet is relatively simple: on the right there are the liabilities such as currency in circulation (which is relatively flat at around $1.1 trillion but rising slowly (for now) every week), and excess reserves, at $1.5 trillion, or the money that is "parked" with banks and is the topic of so much consternation: will it ever spill out into the broader economy, won't it, and if not why not, and if yes, will it cause hyperinflation, and other such

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