Earlier quoted context omitted.
Why would the Fed allow this? Who created the regulation saying they needed a threshold and why aren't they putting more teeth into it? It seems silly to me to have a regulation without proper enforcement and it seems insane to me that the Fed is complicit.
I'm also interested why the FED would want to do this. Could it be to maintain interest rates at a certain target? If the banks don't have money to lend, would it cause them to charge higher interest on their loans?
The cash reserve is just a collateral against the risk, needed to stabilize public trust they will not default at the slightest ill wind.