Wall Street in crisis, 2009
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(Wall Street was rocked this week as Lehman Brothers Holdings Inc. filed for bankruptcy, Merrill Lynch and Co. sold itself to Bank of America Corp. and insurer American International Group Inc. saw its shares plummet as it scrambled to raise billions to stay afloat. Ross Professor Amiyatosh Purnanandam explains how the investment banking world got to this point, and what the future holds for the industry, regulators and average Americans. Banking expert: How we got here and where we're headed? News video commentary with professor.)