For long term rates nobody really knows because for the last 10 years central banks have been buying trillions of the stuff. The US Fed has started selling some and long term rates were rising until the Nov stockmarket selloff. No one is sure what is going to happen next. If we go into recession again with no inflation - long term rates are too high. If inflation picks up, current long term rates are way too low. If the government keeps running huge deficits and Fed keeps selling, long term rates could pick up. Unless Europeans and Asians start buying again of course.