> Both the buyer and seller know exactly what's in the bag: sliced-and-diced pieces of home mortgages.
But they *didn't* know - this was actually the root cause of the subprime mortgage meltdown.
Figure an average mortgage is around $100,000. So if they're selling, say, $26,000,000 worth of mortgages, that's 260 mortgages. Except they're selling at a discount, so it's 300 or more. How long will it take you to audit the value of 300 mortgages and decide who's going to make payments vs. who's going to end up in foreclosure? (Or who's going to declare bankruptcy and make the entire income stream unreliable?)
They've been rated A+, but you know for a fact there are *some* subprime mortgages in there. But how many? 30? Or 270? Is this a nice discount on a decent investment? Or is it a bag of canine feces?
But wait, there's more... it's not 300 discrete mortgages! The $26,000,000 is actually 10% of a $260,000,000 bundle of mortgages - not a specific 10%, just 10% of whatever the pile is worth. And once again - there are "some" subprime mortgages in there.
And here's where it gets really fun - and it turns out that the bank that put this whole thing together has no idea whatsoever what the makeup of the security package is. Changing the analogy, it's like your best friend handed you a revolver for your round of russian roulette, but he's not sure if he put in one bullet or five. Or maybe it's a shotgun. Who knows.
As the bailouts were being debated, at least one economist pointed out that the best course of action would be to freeze trading on the securities, then send in SEC auditors to pick apart all the MBS and rate them honestly, giving them a solid stamp of approval that could be relied upon for trading. It would have shored up the whole industry. But of course that would have resulted in a lot of harm to the investment houses, their executives, and their stockholders. So we didn't do that.
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Philo's Law: To learn from your mistakes, you have to realize you're making mistakes.
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