It's probably reasonable to sell if you're risk averse and can't sleep because you're afraid of what will happen to the value of your portfolio if we do fall off the fiscal cliff.
As for the efficient market hypothesis - that all risks are priced in - well, it might be that the "market" perceives a low risk of no agreement. So if the "no agreement" event is realized, stocks could drop significantly. Moreover, if a lot of people panic, then stocks are going to drop no matter what the real impact on the economy will be.
That said, I don't plan on selling anything myself, but if there is a drop, I will move some of my liquid savings into stocks. All things considered, there's nothing stopping Congress from changing the taxes for the 2012 year after the fiscal cliff deadline... we know that nothing motivates Congress to action like a quick drop in the stock market. (Remember the bailout?)
As for the efficient market hypothesis - that all risks are priced in - well, it might be that the "market" perceives a low risk of no agreement. So if the "no agreement" event is realized, stocks could drop significantly. Moreover, if a lot of people panic, then stocks are going to drop no matter what the real impact on the economy will be.
That said, I don't plan on selling anything myself, but if there is a drop, I will move some of my liquid savings into stocks. All things considered, there's nothing stopping Congress from changing the taxes for the 2012 year after the fiscal cliff deadline... we know that nothing motivates Congress to action like a quick drop in the stock market. (Remember the bailout?)