Will we see the end of monetary policy? No, policy will just be constrained. The current era of easy monetary policy will not end (in the words of T.S. Eliot) with a bang but a whimper. Janet or Mario will walk to the podium and say the same words they do today, and the markets will not respond. Central banks will lose control of the narrative, and we will have to figure out what to do in a world where profits and productivity are once again more important than quantitative easing and monetary policy.
You need to be thinking about how you will react and how you want to protect your portfolios in such a circumstance. Even if that volatility is years off, “war-gaming” how you will respond is an important exercise. Because it will happen, unless Congress and the White House decide to resolve the fiscal crisis before it happens. Calculate the odds on that happening and then decide whether you need to have a plan.
Unless you think the bond market will continue to finance the US government through endless deficits (as so far has happened in Japan), then you need to start to contemplate the end of effective monetary policy. I would note that, even in Japan, monetary policy has not been effective in restarting an economy. It is a quirk of Japan’s social structure that the Japanese have devoted almost their entire net savings to government bonds. As the savings rate there is getting ready to turn negative, we are going to see a very different economic result. Japan with the yen at 200 and an even older society will look a great deal different than the country does today.