Seems Wallstreet leveraged Credit Default Swaps into a speculative instrument.
Credit Default Swaps represent Corporate bond insurance sold by third-parties.
CDS is akin to AMBAC for mortgages. The ratio for insured bonds to actual outstanding is estimated* at 10:1. Not 1:1. Specs presumably hold the other 90%.
When an institution goes under, their third-party insured debt could - under those assumptions - be equivalent to 10X outstanding of actual debt.
For instance, Bear had, if memory serves, 127 Billion outstanding long term debt (bonds and loans). Assuming 10 to 1 = 1.27 Trillion third party CDS sellers are on the hook for...
The reason why this makes sense - specs trade Credit Default Swaps like any other instrument - to game price changes.
When a Bear goes under, those specs who bought CDS for what they presumed to be a quick flip, hold all the way to 0$ when a Bear craters --- and then COLLECT from their counter party (CDS seller) who insured for the full rate of the bond...
Losses then spread to CDS sellers at an assumed rate of 10:1. Which brings down more instutions and the chain reaction is underway.
I don't know much more, at this point. Still looking into it.
Basically, Niederhoffer did this on a micro-scale - sell short premium and hope a black swan doesn't materialize.