Blame bankers, not the model

One banker contrives a metaphor to defend the universal banking model. If you set two BMW 5 Series cars to race around a track and only one makes it back, that tells you that one of the drivers made a mistake, not that the BMW is a bad car. So don’t junk universal banking, through a forced separation into utility banking, comprising retail deposit-taking and commercial lending, away from trading in securities, just to punish the mistakes of poor chief executives who drove their banks into a wall in the reckless pursuit of profits in complex instruments that they didn’t understand, using leveraged proprietary risk-taking they couldn’t control.

That wasn’t a flaw in the model: it was human failure.

This is the argument now being taken to investors in the stocks of large universal banks that have survived the...