In addition to the realization that economic news would have to be really bad for the Fed to cut rates further, there are two problems with the markets today, both dealing with a change in perception on two key sectors--financials and energy.
1) In financials, it's one thing to talk about writedowns due to CDOs and leveraged loan committments, but it's another thing entirely to say that some banks may have to cut their dividends, which is what CIBC talked about when it cut its rating onCitigroup . Citi pays a dividend yield of 5.2% (that was yesterday; it's now 5.6% becuase of a 7% drop in today's price). A lot of investors own some of these stocks for their dividend yield (B of A has a yield of 5.5%, Wachovia 5.9%, Washington Mutual 8.5%); so talk of cutting dividends--even if it's just from an analyst--is enough to cause concern.