[quinnchr]

Hmm yes those 1/3 of Fortune 1000 companies who do decide to prefund (which is entirely optional, unlike for the USPS) do so at average of 30% of liability. At the USPS pre-funding rate they're projected to have 73% of future liability funded by 2016.

I think you're on to something though, we should definitely require private sector retirement benefits to be pre-funded by 100%, then we can all point our fingers and say how obvious it is that the private sector is less efficient.