More than four years after the worst economic crisis since the Great Depression, the nation's financial institutions remain dangerously interconnected, according to a report issued Wednesday by the independent watchdog that is overseeing the Troubled Asset Relief Program.

Banks and other companies deemed too big to fail in 2008 continue to form the foundation of the U.S. economy and have become even larger, the special inspector general for Tarp said in a 374-page report to Congress.

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