In another question I asked someone pointed me to an answer where NIIP (Net International Investment Position) was mentioned as a measure of economical development, which I already heard about it and it makes sense since it takes into account not only the actives but the pasives of a country
But then you see this list, and you find out that first world countries like United States, Australia, Sweeden or Spain are in big red. What does this mean? Does it mean that NIIP is a poor index to measure economical development or wealth? Or does it mean those countries are in a serious bad situation which could lead them to be in a crisis in the future?