By Ryan Vlastelica
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Italy's president said Silvio Berlusconi, the country's prime minister, would resign after a new budget law was approved. Equities had hoped for a resignation, which is seen as clearing the way for a leader who will act more aggressively to tackle the country's debt problems. The PHLX Europe sector index <.XEX>, which includes major European shares, advanced 1.8 percent.
All 10 S&P 500 sectors rose, but banks, which generally suffer whenever Europe fears surge, did particularly well. The S&P Financial Index <.GSPF> was the top gainer, advancing 1.9 percent. Wells Fargo & Co <WFC.N> added 4.4 percent to $26.53 and Citigroup Inc <C.N> gained 2.9 percent to $31.42.
Trading had been choppy for most of the day after Berlusconi won a vote on the ratification of the budget, but he failed to obtain an absolute majority in the Chamber of Deputies, leading to calls for him to step down.
Despite the stock market's jump on the news, many analysts expect recent volatility to persist.
"The optimistic view is that this is what was needed, we'll get new blood that will allow us to start being constructive and moving on reform," said Mark Lookabill, wealth advisor at Carson Wealth Management in Omaha, Nebraska.
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"But there's also a pessimistic view that doesn't care who is in charge, thinking we'll just get the same old thing with no new credible plan ... when the pessimists come in questioning what happens from here, we could move right back down."
The Dow Jones industrial average <.DJI> shot up 101.79 points, or 0.84 percent, to 12,170.18. The Standard & Poor's 500 Index <.SPX> gained 14.80 points, or 1.17 percent, to 1,275.92. The Nasdaq Composite Index <.IXIC> advanced 32.24 points, or 1.20 percent, to 2,727.49.
An S&P Energy Index rose 1.4 percent, while the Dow Jones Transportation Average <.DJT>, regarded as a barometer of demand, climbed 1.2 percent. A semiconductor index <.SOX> added 0.6 percent.
In Monday's session, equities traded erratically until Juergen Stark, a member of the European Central Bank's Executive Board, gave an optimistic timeline for when the crisis might be resolved. Wall Street then staged a late rebound to end higher.
The CBOE Volatility Index or VIX <.VIX>, Wall Street's so-called fear gauge, fell 7.9 percent and is down 8.7 percent so far this week.
With little on the U.S. economic calendar this week and earnings season drawing to a close, investors' attention was fixed on Europe. According to Thomson Reuters data, among the 442 S&P 500 companies that have reported earnings so far, 70 percent topped expectations.
In corporate news, an experimental antidepressant from AstraZeneca Plc <AZN.L> and Targacept Inc <TRGT.O> failed to meet the goal of changing a key depression rating score in the first of a series of pivotal clinical trials. Targacept shares plunged 60.2 percent to $7.61.
Rockwell Automation Inc's <ROK.N> quarterly profit and 2012 outlook beat analysts' estimates, sending its shares up 6.5 percent to $74.33.
Advancers outnumbered decliners on the New York Stock Exchange by a ratio of about 3 to 1,, while on the Nasdaq, more than two stocks rose for each one that fell.
(Reporting by Ryan Vlastelica; Editing by Jan Paschal)