It is not solvency, or the lack of capital - a vague, synthetic, and usually quite arbitrary concept, determined by regulators - that kills a bank; it is - as Dick Fuld will tell anyone who bothers to listen - the loss of (access to) liquidity: cold, hard, fungible (something Jon Corzine knew all too well when he commingled and was caught) cash, that pushes a bank into its grave, usually quite rapidly: recall that it took Lehman just a few days for its stock to plunge from the high double digits to zero. It is also liquidity, or rather concerns about it, that sent Deutsche Bank stock crashing to new all time lows earlier today: after all, the investing world already knew for nearly two weeks that its capitalization is insufficient. As we reported earlier this week, it was a report by Citigroup , among many other, that found how badly undercapitalized the German lender is, noting that DB's "leverage ratio, at 3.4%, looks even worse relative to the 4.5% company target by 20...