4 ideas
In September 2008 the Fed and Treasury let Lehman Brothers file for bankruptcy on Sept. 15 after no private buyer emerged. Bernanke says the difference was not a policy choice: Lehman lacked adequate collateral for a legal Fed loan, while AIG's insurance businesses could secure one. The episode is the test case for whether the rescues followed a principle or were improvised.
Bernanke argues that 2008 was a classic run on short-term wholesale funding such as repo, commercial paper, and money market funds, not only a solvency crisis. The remedy was Bagehot's rule: lend freely against good collateral to stop the run. By this logic the rescues protected the credit system that households and firms depend on, not bankers.
Bernanke reads the crisis through his academic work on the Great Depression. That work held that the 1930s Fed turned a downturn into catastrophe by letting the money supply contract and banks fail en masse. He treats avoiding those specific errors as the benchmark for action, so doing too much counts as the lesser risk and doing too little as the historically proven one.
Once a firm is large and interconnected enough that its disorderly failure would bring down the system, regulators without resolution powers must rescue it. A rescue creates moral hazard, but refusing one inflicts the damage on the wider economy. Bernanke uses this bind to argue that the fix is a legal wind-down mechanism and stronger capital rules, such as those Dodd-Frank created, not refusing to intervene in the middle of a crisis.