The document provides background on the demise of Lehman Brothers during the 2008 financial crisis. It discusses several factors that contributed to Lehman Brothers' bankruptcy, including market complacency during the housing boom, homeowner speculation and deteriorating lending standards, and bad regulation. As the housing market declined and mortgage delinquencies rose, Lehman Brothers faced significant losses due to its large holdings of subprime and lower-rated mortgage-backed securities. Despite talks with potential buyers, Lehman filed for bankruptcy on September 15, 2008, deepening the financial crisis.