I rather liked this video, myself;
http://www.youtube.com/watch?v=VlvVumYdMGsOh and there's this too:
http://www.youtube.com/watch?v=UC31Oudc5Bg (notice however that they get colateralised debt wrong; it's not all dodgy debt and they do know what's in them, but when there's a housing crash what's in them starts being worthless)
Worth remembering of course that sub-prime mortgages are only the particular cause of this crisis. The underlying causes would appear to be (perhaps depending upon who you ask): (a) human intellectual limitations; if it were transparent to everyone that this was, in the long run, a very bad idea they probably wouldn't have done it but it wasn't because the degree of thought required is too great and the incentives not to think too hard about something which is driving profit, and is being pursued by one's competitors, is too great and (b) there is not enough of an incentive to avoid risk taking and engage in costly internal scrutinize because (bi) large financial institutions can rely on the federal bank bailing them out if they risk bankruptcy and arguably (bii) the federal bank is right to do so because the government has an obligation to protect e.g. the pensions of the citizens who use those banks and as far as this crisis is concerned there's no additional 'lack of disincentive to take risks' effect of not bailing the banks out when disaster has already happened (though it might have that effect on future behaviour).
To deal with (b) there are proposals to separate investment banking from retail banking (pensions etc) which the coalition is going to look into and in America some people are suggesting a cap on the financial size an institution should be allowed to grow to whereas others are demanding the federal reserve declares that it will no longer act to bail our institutions which are set to go bankrupt in the future. This might create incentives for the banks to deal with (a) themselves, alternatively there is work underway on how to more effectively regulate and scrutinize what the financial sector is engaged with externally. Vince Cable is on the case!
Transatlantically it would be hard not to improve on the status quo. I've already mentioned the apparently strange status of the ratings agencies. The three ratings agencies were protected from additional competition by Nixon, so far as I can see for the same reason we limit university accreditation - so punters won't be bamboozled by phony agencies - but it was felt that three agencies was sufficient competition for them not to get lazy. In practice however it seems that they largely just copied the judgment of each other and didn't rock the boat in a way that, if ratings agencies were competing properly to get favoured status or were otherwise motivated to 'take risks' e.g. by declaring CDOs to be suspect and the housing boom to be dangerous as a lot of financial journalists were doing they might be willing to. Meanwhile one body responsible for financial regulation in the states was... er...
http://abcnews.go.com/WN/sec-pornograph ... d=10451508 Reminds me of this:
http://www.youtube.com/watch?v=O5yQNwu0kTc