its a matter of congressional record and congressional hearings- the unprecedented suddenness of the collapse was aided by shorters -lehman brothers- due to shorter induced panic- didnt fall 62% in a day due to home loans alone- which then spread the panic

huge companies mothballed huge projects that were 90% finished overnight- literally overnight due to the shorter induced panic-which was unbelievable-you would think the co's thought it was the end of the world -which is why my friends construction co collapsed
shorters were ready and willing to bring on the collapse

thats why shorting was prohibited in certain financial sectors for ca 6 months