The answer is no, it won't kill monetary policy, but here's the way it might constrain the Fed, which relies on primary dealers (that is, big banks, who would now be subject to leverage requirements) to help it set the federal funds rate. This reliance has been cited as a reason to delay the leverage rule. Felix Salmon also thinks that's no reason to delay the imposition of the rule, but here's how the argument works, in his nicely straightforward words:
The way that the Fed conducts monetary policy is by instructing the traders at the New York Fed to buy and sell certain financial instruments so that a particular interest rate — the Fed funds rate — is very close to a certain target. Through a complex series of financial interlinkages, setting the Fed funds rate at a certain level then has a knock-on effect, and ultimately helps determine every interest rate in America, from the Treasury yield curve to the amount you pay for your credit card or your mortgage.
Those interlinkages are so complex that they’re impossible to model with any particular accuracy: all the Fed can do, really, is set the Fed funds rate and then see what happens to everything else. And directionally the causality is clear: if the Fed wants rates to rise, then it pushes the Fed funds rate upwards, and if it wants rates to fall, then it brings the Fed funds rate down. That doesn’t always work at the distant end of the yield curve, but it’s still most of what monetary policy can do.
Especially early on in the chain, a lot of the interlinkages take place at the level of big banks. And so it stands to reason that if you change the leverage requirements of big banks, that might change what happens to interest rates when you move the Fed funds rate.
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