What’s in a name? The final proposals for bank-capital rules were dubbed Basel 3.1, as if to suggest a minor tidying-up exercise – just a few grace notes added to a melody composed long ago. But banks, concerned that the implications would be more severe, spoke of Basel 4, implying not grace notes, but a reworking of the entire composition, now in a major key. That name didn’t stick. Regulators insi...