Social security takes my money that I am forced to invest in the system and pays it to people who were forced into the system before me. The only major difference with a dictionary definition ponzi scheme is that the system is not designed to incentivize future risk on my part. But then it does not have to because I am forced into the program. And it sounds pretty damn close to the SEC definition of a ponzi scheme.

Ezra Klein can manipulate all the words he wants, but when you get to the actual definition of a ponzi scheme, social security sure as heck looks a lot like one.