It has been a tough couple of days in the markets, and it looks like today will be another. Not only is the market down in pre-market trading, but this is also a quadruple witching day (i.e., when four types of derivatives all expire on the same day). That often leads to volatility and, in the context of the past couple of days, means today could be difficult as well. I see the effects in my portfolio, and you may have seen them in yours as well. Should we be worried? In a word, no.