The original deal saw MUFG buying $6bn of preferred Morgan Stanley stock and $3bn of common shares. Now MUFG will plough $7.8bn into preferred stock, which will convert into common stock at $25.25. This is lower than the $31.25 conversion price initially agreed, but still well ahead of Friday's $14.22 share price. The residual $1.2bn will meanwhile take the form of non-converting preference stock, essentially a permanent loan

This seems like a fair compromise. MUFG gets more interest income from its Wall Street prize for the same money thanks to the prefs' 10 per cent yield. Meanwhile Morgan Stanley gets capital without a wholesale takeover by the Japanese.

But risks attach too. First, the re-cast deal reportedly required a US government pledge that any equity injection it might subsequently make would not wipe out MUFG's investment. That, after all, was the fate of investors who bought preference shares in Fannie Mae and Freddie Mac earlier this year. For its part, Morgan Stanley will have to cough up more for its money, via higher dividends.