If you buy a T-Bond at 110 the treasury will pay you back 100 at maturity, thus you lost money in nominal terms (depending on coupon rate). This has been happen

If you buy a T-Bond at 110 the treasury will pay you back 100 at maturity, thus you lost money in nominal terms (depending on coupon rate). This has been happening in Europe with their previously negative yielding debt What you mean to say is there's no credit risk. Not the same thing as you can't lose money. Saying you are guaranteed X dollars 30 years from now does not mean much at all if people need money today. This is not "safe" or prudent