The entire market is just dropping due to the disparity between the dollar and other currencies. Companies keep posting good results (Apple was fantastic, IBM did decently) and the stocks keep dropping. We're at the lowest it's been in five months, and it could always go farther.
You know, I seem to remember there being a mini-"recession" about fifteen years ago, in the early 90's. And then, if you go fifteen years after that, you're in the late 70's, where we again, had a crappy economy.
FedEx, though, is down nearly 2% more than UPS.