I was discussing low interest rates, not negative. But usually in the US when we talk about a negative yield we're talking about a negative real yield not a ne

I was discussing low interest rates, not negative. But usually in the US when we talk about a negative yield we're talking about a negative real yield not a negative nominal yield. There is a "zero lower bound". Perhaps an algorithm would buy a bond at a negative yield but probably not a person. Or, a central bank may purchase back bonds at negative yields to get the cash out there. Europe is a different story, I don't know entirely how they run their monetary system.