Editor’s note: All this week on the Business Desk, we’ll be featuring contributions from economists, financial journalists, and other experts on the origins and impact of the financial crisis. Today, nearly a year after the collapse of Lehman Brothers…

The U.S. government has again bailed out Citigroup, unveiling a bold plan Sunday night to inject $20 billion in fresh capital into the troubled financial giant and shoulder most of the potential losses on $306 billion of high-risk assets.

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