I don't know about the rest, but he never really addressed the criticism that SS is a ponzi scheme. He just said that it was solvent.

1) SS can be solvent until the year 4019 if you keep adjusting the benefit.

2) SS relies on the next two generations to fund current retirees until they die. If the we stopped having 2.5 babies per family SS would become insolvent pretty quick.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman