Take it back a step: this is the WSJ video on Repo markets I linked in the post "why did the Karens suddenly stop lending." Because it still amuses the fuck out of me that the WSJ is referring to "marks" (institutions who buy) and "Karens" (banks that stop lending). There's a lot of jargon in finance. I have beef with this. So basically: In order to buy and sell stuff while also owning stuff, there needs to be a market where stuff collateralizes money. There's an organization whose job it is to control how much profit that market makes and starting in September, that market started telling the organization to eat shit. The organization responded by filling it full of money so that now, it is controlling how much profit that market makes by pouring money into it. In short, a closed system is now open. This "closed system is now open" is the basic shape of every financial crisis you've ever seen, but don't tell the rubes that.