This video gathers the info, crunches the numbers, and makes a good analysis with suggested alternatives for a greater return. I feel this video provides a useful perspective.

One word of caution. Any return in the market place is a result of a portion of productivity being used to reward capital investors. Any "return" calculated on Social Security is a percentage of inter-generational wealth transfer.

Although it is good to analyze these programs on their own merits, we sometime error in thinking that the true goals of the program are the stated goals of the program. With governments this is rarely the case. Mandating, taxing, and paying benefits means controlling wealth, incentive, and punishing & rewarding according to political whim rather than as a result of wisdom, diligence, analysis, and prudence. Each governmental program is a slush fund to reward somebody at the expense of somebody else. There is no trust fund. There is only wealth transfer, from those paying in (younger, working) to those receiving out of (retired or aged). Any difference between the inflow and outflow detracts or assists other slush funds.

Enjoy the video.