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4 big challenges for new Fed Chair Janet Yellen
1. Bubbles.
Margin calls, when brokers call in the collateral that backs margin debt, are one of the things that could intensify a stock market correction, turning it into a bursting bubble.
2. Global aftershocks.
Emerging market turmoil, in turn, is pushing down stock prices in the United States and Europe.
3. Scarce jobs.
The risk now is that the Fed may have to raise rates, as a bulwark against inflation, before the labor market is convincingly healed.
4. Political meddling.
Some Fed critics feel the central bank should focus only on inflation and forget about employment, while others feel Fed policy should be less subjective and more beholden to firm rules that would dictate policy, almost like an algorithm.

http://finance.yahoo.com/blogs/daily-ticker/4-big-challenges-for-janet-yellen-165657459.html