Daniel Wagner

A dismal U.S. jobs report and other evidence of a global economic slowdown clobbered U.S. stocks Friday. The Dow Jones industrial average dropped more than 200 points, leaving it down for the year.

A move by the world's central banks to lower the cost of borrowing exhilarated investors today, sending the Dow Jones industrial average soaring 490 points and easing fears of a global credit crisis similar to the one that followed the 2008 collapse of Lehman Brothers.