All countries including China are in massive debt (maybe Switzerland isn't, not sure). The federal reserve may be the lender for the United States (either wholly or partially). So what about Canada, the UK, Japan, etc.?
National debt is a concept that lots of people are aware of. However, debt typically implies a lender. Stefan talks a lot about unfunded liabilities. Does this mean the debt is structured in an atypical way? If not, who is all the national debt owed to?