Indeed, clearly lending to subprime lendees is unsustainable in the long run. Credit derivatives in itself is not a market failure (as derivatives naturally hedge risk), but they were being used in the most unsustainable behaviour showing the biggest misallocation of resources I've seen to date. Many main street investors were fed twisted information, whilst only the big guns in Wall Street having access to the $100tn or so (i think?) market. Clearly it'd be unsustainable and lead to bubble burst.
And collin is exactly right for the market failure from the conditions arising from the GFC. If the U.S. Government didn't inject the TARP package to the major financial institutions, this would cause a major collapse of the whole American banking and financial system. But at least then the market would be clean of all the failures resulting from those toxic derivatives. In reality though, the results would be too devastating to measure.
Every single aspect of the GFC is market failure:
- Heavy Misallocation of resources into Credit Derivatives to cover Subprime Mortgages
- Information asymmetry
- Resulting outcomes, including bank runs due to the GFC