The Super Committee's failure to come to an agreement on significant deficit reduction—and the possibility it may undo the automatic $1.2 trillion in budget cuts—is risking another U.S. debt downgrade, a 10 percent drop in stocks and a decline in the US dollar, analysts say.

US Capitol Building with cash

“Failure to reach agreement on at least the minimum required savings will reflect poorly on Congress and the S&P 500 could fall by 10 percent to 1100,” said David Kostin, Goldman Sachs equity strategist, in a note. “The wide range of possible outcomes on both the super committee process and the unstable political economy in Europe drives our view that investors should assume the worst while hoping for the best.”