John Mack, CEO of Morgan Stanley, said today: "we are in the midst  market controlled by fear and rumours and short sellers are driving  our stock down." At the start of the year, I asked in one of my blog posts: "After  Nothern Rock, Bear Sterns, who will be next?" Well we have now the  answer: it is Lehman Brothers and AIG that went under. Lehman is now  under administration and AIG has been refinanced by the US government.  This prompts two comments. 1. It is traditional, considered low risk institutions that have been  hit the hardest by this financial crisis, and not the sophisticated  and highly criticised institutions like hedge funds or private  equities. Indeed, AIG was rated AAA by Standard and Poors no sooner  than a few days ago. 2. The business model of investment banking itself seems to be broken.  Hence, the last decade has seen the disappearance of Bearing's,  JPMorgan, Bear Sterns and Lehman Brothers as independant entities( and  even disappeare...