Mercurial.

“Wall Street rebounded from its worst week on record with its best single day ever on Monday, as countries around the world pledged to pour cash into their struggling banks to prop up the global financial system. The Dow Jones industrial average soared 936.42 points, or 11.08 percent, to end unofficially at 9,387.61 while the Standard & Poor’s 500 Index jumped 104.06 points, or 11.57 percent, to finish unofficially at 1,003.31.” [Reuters]