Does that validate the guess #1, that there is a trust from lenders in the future of [US] economy, as you're saying that $1 now < value of that $ tomorrow? In other words, it's ok to lend 1$ today because tomorrow that $, even if devaluated, will help people getting more services and maybe getting more $.

That is very interesting. It sounds like we manage to magically create some unlimited resources that is creating the world's wealth and strength. It sounds magical. What's the catch? What's the limitation of creating more wealth, faster? Is today's dollar value simply based on the value that it can potentially have tomorrow? - From a non-economist point of view, it's quite hard to picture.