Conflating market rates with fiat fed rates.
If there is a shortage of dollars, market actors will pay more due to borrow due to low supply and high demand.
If there is too many dollars, inflation is going up, and the fed will raise rates to disincentivize borrowing, which is how new money is created.
This is because the fed isn't a market participant who lends based on market rates.
That being said, we never see the first scenario, because there is no dollar shortage ever. You can always borrow at a lower rate from the fed. This kinda can occur with the Eurodollar markets that don't have access to the fed rate, but at the end they can still eventually access the fed rate after paying a couple extra middlemen banks to launder the loans to them.


