[rodguy911]

I can give you 30 or 40 million reasons why they are not sound. It's called people that do not belong in the system since they never paid for it. That's the cause and little else. When you put millions and millions of dead-beat losers and more millions of illegals on a system that you should have paid into and didn't of course it's not sound actuarial.
You are right. It's not sound. But, that's the reason,little else.

[kabar]

People living longer and linking benefits to the cost of living also increase the costs. Spousal and dependent benefits for those who never paid into the system are also a reason.