Is this possible for all countries? Surely the lowest gdp (maybe per capita) country in the world that has pension funds should be eligible to invest these fun

Is this possible for all countries? Surely the lowest gdp (maybe per capita) country in the world that has pension funds should be eligible to invest these funds outside of the country. A priori, without knowing anything about world economies, we shouldn't expect every country with pensions to even have local possibilities of investment. There's possibly a country where every single tax payer works remotely, or in local administration.