Though bank stocks and the broader markets soared Monday after the Treasury Department released details of its public-private partnership plan to buy banks' toxic assets, analysts questioned whether the rally is sustainable, particularly ahead of first-quarter earnings reports.

The KBW Bank index surged 18.59%, and the Dow Jones Industrial Average and the Standard & Poor's 500 index rose 6.84% and 7.08%, respectively, after Treasury Secretary Timothy Geithner disclosed long-awaited details of his plan to deal with the industry's bad assets. The government said it would use up to $100 billion from the Troubled Asset Relief Program to leverage private capital and buy $500 billion worth of bad assets from banks. The program could expand to $1 trillion.

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