[vec]

> This kind of system is more or less impossible in the US and it would be extremely expensive.

That's literally how Social Security works, and the fact that more guest workers pay payroll taxes into the system than are eligible to collect benefits from it actually makes it slightly cheaper than it would otherwise be.

[ThomPete]

That's how social security works and it works great in countries with little immigration not in countries like the US where there have historically been.