Professor Larry Ball, our friend and colleague, has written a fascinating monograph reexamining the September 14, 2008 failure of Lehman Brothers. Following an exhaustive study of documents from a variety of sources, Professor Ball concludes that the Fed could have rescued Lehman. The firm had sufficient collateral to meet its liquidity needs, and may have been solvent. The implication is that the worst phase of the financial crisis was preventable. (A short summary is available here.)

We are skeptical on several fronts—that Lehman was solvent, that policymakers had authority to lend to an insolvent institution, and that doing so would have limited the financial crisis...