The weird thing about this is that Social Security isn't even hard to understand. Taxes go in, benefits go out. Unlike healthcare, which involves extremely difficult questions of technological advancement and the specter of rationing, Social Security is just arithmetic. The chart on the right tells you everything you need to know: Right now, Social Security costs about 4.5% of GDP. That's going to increase as the baby boomer generation retires, and then in 2030 it steadies out forever at around 6% of GDP.

That's it. That's the story. Our choices are equally simple.