[quote name='ChurchSkiz' timestamp='1303249283' post='4800524']
A person working at 25 who puts 6% of his paycheck in an A rated bond (8% return) will have $1.2m at 65 and with 8% could draw $8k a month for life, not including any 401k or employer matching contributions.
Having an 8% return in the long run is incredibly unrealistic. If you actually look at long run numbers, you'll realize that on average, you can't do significantly better than just putting all the money into long-term government bonds, which are perhaps half that return. Sure, some people manage to beat that number in the short run, but periodic crashes tend to cancel that out - just consider all the stories about people who lost their private retirement funds as a result of financial crises. Also, for everybody that gets lucky and gets incredible returns, there will be more than enough people who don't manage this. Finally, you are conveniently ignoring inflation, which does have a significant effect over such time scales.
So sure, some people will get lucky with private capital-based retirement funds. As a society-wide retirement system, it is a horrible idea.
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Please provide data, the average return of the S&P 500 over the last 140 years is 10.6%. 8% is a conservative number in investment terms, which amounts to a typical A rated bond (which is a secured investment and thus considered fairly "safe"). Unless someone invests all their money in one stock, or cashes out at the bottom of a crash, their retirement money is going to be ok, as proven statistically over 3 pretty strong market crashes in the last hundred years.
I'm also not conveniently ignoring inflation. Inflation is real but it is also real for SS funds as well. Which means that the current system is even more unstable when you factor in that inflation is outpacing the rate of investment. Rate of return on SS money is around 2.76% (http://www.ssa.gov/oact/progdata/fundFAQ.html), and average inflation is around 3.4% ( http://inflationdata.com/inflation/Inflation/AnnualInflation.asp). So certainly the 8% you can get privately is going to outpace the rate of SS and be a better option for anyone that is smart enough to invest privately.
As for society-wide, I acknowledge that some people really suck with money, which is why the system should be voluntary. If someone wants social security and wants to pay for it, I think that's great. But for a vast population of this country, we are throwing dollars at dimes and told it's a good deal. I'll pay around $300k in 40 years and for that I get a small monthly paycheck and as soon as I die it's gone. And there's a high likelihood by the time I go to retire I will get even less benefits than what is promised to me currently. I am much better off paying a straight tax to those who can't invest and keeping at least some of my money.