The only reason there is a crisis about Social Security in...

The only reason there is a crisis about Social Security in the US and pensions in Europe and Japan is that you cannot maintain a "Ponzi" scheme indefinitely. We have collected from today's young to pay today's old and counted on tomorrow's young to keep doing so. That was a fine scheme as long as the number of young people was rising faster than old people. When that ratio comes to an end, such a system also has to end.