Interest rate setting is supposed to throttle the demand for loans. Lower interest rates, higher loan demand. Therefore, more money enters the economy.
However, the other side of the equation is the banks' appetite for giving loans. There are times when banks (due to regulation or market risk they perceive) that they'll be more or less likely to make loans regardless of the demand side.
The fed seems to be only controlling the demand and not the supply. They cannot force banks to make loans more willingly directly.
Another aspect is the appetite for the sorts of loans banks want to give. There's an argument that too many loans are now given for speculation (housing, asset purchase) and not for things that grow the economic pie like small businesses. Small business are more risky for the banks than speculation so we end up in this sort of undead economy.
The only other way is for The Fed to monetize the Federal Government's deficit spending.
This didn't regularly happen until 2008 - but I'm skeptical that the genie will ever be put back in the bottle.
> The results are as shown below as of end-2018: USD57 trillion, nearly three times the size of the US economy before it was hit by the COVID-19 virus. Even if this measure is not complete, it underlines the scale of the market.
The Fed can do that any time they want by buying bank debt with newly created dollars, which effectively socializes the risk in the banking system, so it doesn't fail, hopefully at something resembling market rates. The Fed then runs the risk that they don't get paid back instead of an individual bank, but the modern Fed cannot fail, that sort of thing can only affect the currency as a whole, by weakening it generally speaking.