Inflation and living longer are two issues. Higher prices services were the providers have an actual or de facto monopoly. More things to buy now than you used to. Throw in some one-way exports and you have some issues.
It costs more, both psychologically and actually, people are collecting more benefits than were put in, and the money that was bouncing around our economy and having taxes paid each time it changed hands, is now leaving the country and doesn't make the government any money.
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