I'll give a little bit simpler explanation from my viewpoint.
QE means the Fed does open market operations and buys treasuries and MBS or bundled mortgages. If you have an IRA for example, and go look at fixed income assets that you can purchase, you'll see things like US Treasuries for sale by 3d parties.
Treasuries are like any other asset, they are worth what people will pay for them. With the Fed buying, they're worth more than would be 'natural' right now.
Lets step back, in 2019 I paid $50,000 for some treasuries and they yield 2.125%. In that 2 years, that's about 4.25%. But I can sell them now and get 6.14% return, i.e. a bit over $53,000. This is real, I actually own these and that is what they are worth right now. That is a 3.1% return from treasuries that would otherwise have a yield of 2.125%. The extra is because, if you were to buy a brand new 5 year treasury, it would yield around 0.88%. I get paid the difference in the yield by the buyer.
So a lot of investors will sell. The Fed has driven up the price of the treasuries such that it's not worth waiting another 5 years to maturity to get another $3000 when I can get half of it right here right now. Now I have $53,000 sitting in my IRA. I then re-invest it in stocks and so on.
However the above takes time.
It's slow.
What if you want to suck money out
right away?
Well, you tell the banks and funds that if they buy your assets and deposit money, you'll repay them for those assets in the future for a given % above their value.
Back in April 2020 the Fed dropped Repo rates to zero. This basically told the banks, you won't get any return from repos with the Fed, put your money to work elsewhere. This made sure that money out in circulation kept circulating, the banks and MMFs had to do something else with their money.
I keep using the word bank. The Fed has other ways to stop money flow from member banks. Reverse Repos are more for things they don't directly control, like Money Market Funds Hedge funds and corporate investment funds.
This was the very first move to loosen money supply in 2020, it's the first move to tighten now.
Reflected here, they went from ~200B to over 750B in about 6 weeks. This cash got sucked right out of the economy.
Now I don't know for a fact, but common sense would indicate, this is a direct result of the surprise inflation numbers.
It may also be the real reason for turbulence in the markets.
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What this tells me, is when inflation went up the Fed was like :
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Now they didn't want to panic anyone. They're still doing QE. But that reverse repo operation? WTF. That's 7 years of repos up on that chart. Someone at the Fed shit a brick.
These are bankers and politicians, not the salvation army. They're going to care more about the currency than your job.
Collapsing the currency would ultimately result in the same problem anyway, so why would they do it?