I think your assumption is incorrect. Towards the end of the interview Mr. Barofsky said: The last crisis cost $13 trillion.
This number is close to the GDP of the U.S., so I think he literally meant the total annual economic output of the U.S. I’ve never seen a number that high as regards the losses associated with the crash, but I’m far from an expert on the subject.
Yeah I have no clue what that number is supposed to represent so I was guessing. I have never seen any estimate anywhere spthat says the financial crisis cost $13+ Trillion.