Stepping back: I admit that originally, Soc Sec was not a Ponzi scheme, by my definition. But then Congress realized that there was a huge Baby Boom bubble, and created the Trust Fund. And THEN Congress realized that while one could not get reelected by doing the right thing and leaving the Trust Fund alone, one certainly COULD get reelected by looting the Trust Fund now and giving much larger benefits, especially in the Disability and Supplemental categories. (As Coach Duke said, "The pension fund was just sitting there!")Quite. Check the cross-references while you're there.
So, when the Baby Boom bulge in retirements happened, Soc Sec became a Ponzi scheme. The benefits were much too large, the Trust Fund was actually debt, not assets, in a period of large deficits. And we don't have nearly enough new people entering the system to keep you fat ass 'Boomers in scones and lattes.
Now, our President, who seems to think every day is "Opposite Day," proposes to solve the Soc Sec problem and the unemployment problem by... by... (I can't say it)... cutting the taxes that finance Soc Sec. Not, mind you, as part of an overall plan with offsetting cuts to make Soc Sec NOT a Ponzi scheme.
Now it will be a Ponzi scheme on stilts, with gold plating.
A link-rich evaluation of "Social" "Security" by Professor Munger.