global market fall- from where it started

could not help myself posting the link of a video which explicates the root cause of the failure of major global financial institutions and falling global market.

from where and how actually it started ?

http://www.metacafe.com/watch/1814097/what_caused_our_economic_crisis/

Also see how Nassim Taleb reacts.

http://in.youtube.com/watch?v=ABXPICWjFIo

Ankit