Over the short-term for the US markets, it's hard to be anything but bullish. Most believe the Fed won't taper until 2014 due to the economic damage of the government shutdown. Plus, with the holiday shopping season around the corner, consumer spending (70% of US GDP) is bound to get a boost. Over the medium-term, things are a bit more hairy. The Fed will likely start tapering bond purchases (depending on economic growth) which have been a massive positive catalyst for equities. And let's not forget the next debt ceiling/budget battle is set for January if the two sides can't agree on a longer-term solution in December. I believe the key development to watch in 2014 is how Yellen's beliefs impact the Fed's actions moving forward.