The bankruptcy of the investment bank Lehman Brothers was the pivotal event of the 2008 financial crisis and the Great Recession that followed. Ever since the bankruptcy, there has been heated debate about why the Federal Reserve did not rescue Lehman in the same way it rescued other financial institutions, such as Bear Stearns and AIG. The Fed's leaders from that time, especially former Chairman Ben Bernanke, have strongly asserted that they lacked...