I think it was a mixture of many things causing this credit crunch.. but not really not down to traders..... for what its worth here's my thoughts on some of what caused it...
The Main culprit being...
HUMAN NATURE...
followed by and including
love of easy credit (on both sides of the equation)
credit derivatives no one quite understood (honestly they really couldn't be understood),
clueless greedy ratings agencies,
regulators (FSA & BoE) who were just not up to the job,
greedy bankers offering easy credit made avaialble by
securitisation and off balance sheet accounting - (how do regulators explan that one???)
greedy careless heads of banks who really didn't understand what games their banks' staff were playing but were happy so long as the numbers look good.
Banks who each new they were packaging up risky rubbish to sell for good profits (kind of clever) but who nevertheless were kind of stupid enough to think that other's banks' risky rubbish (securitised loans) was a good investment, ha ha h a !!!!
a govt' (or govts) who happily unquestioningly let all this carry on cos they thought it was their economic genius at setting interest rates too low by proxy causing a boom (abolishing bust) but not worrying at all about high levels of debt amongst the population,
too low interest rates, masked by the excuse of cheap Chinese manufacturing & labour, institutional lenders & investors not even bothering to stop & think what 'sub prime' might mean, mostly cos they were getting an xtra 25 basis points for not thinking about it.
This is not to mention the consumers who were happy to spend far too much money they didn't have on luxury items they don't need irrespective of their earnings/financial state, who then started taking storage space in Big Yellow buildings for all the junk they bought but can't fit into their homes.
bubbles everywhere!
Next ... we'll see if the credit default swap market will stand up or not. That was an even more ridiculous racket than the other credit derivatives, no way did bank's management ever understand what they were all about.
The Queen's tough question about the credit crunch has not been answered - Telegraph