Retirement pensions are one thing, the other is debt - whenever I hear that all countries are in debt I think of the law of conservation of mass and have an obvious question: who is this monumental, multiple-GDP debt owed to?
I figure it must be the private sector, but in such case - why are they lending? It looks like either there are people with resources they have no idea how to invest in something actually productive or there are people who knowingly choose to invest in this somewhat risky business of "pay companies to do something for the public now and hope that the public will return you more than the GDP of the whole country, maybe it will work out", which is how I see these big national debts.
Who are these investors and how hard would it be to make them cut their losses?
At the risk of committing a blasphemy against capitalism, could it be a sign of insufficient taxation of the proverbial "top 1%"? This doesn't necessarily need to be "top 1% individuals", maybe it's "top 1% companies" or "top 1% banks" or whatever. In either case, it appears that somewhere, someone has some big money which is being spent on public projects anyway but under the guise of an "investment" which may actually be a big dud.