There's constant demand for longer debt from pension funds and other investors who follow the index.

Bonds have a tendency to rise when banks and overseas investors buy a lot in the market. Their demand to buy on dips has not slowed down.

A decline in stocks is giving a boost to bonds.

An increase in purchases by overseas investors is a reason for bonds to rise. It will assure investors that yields won't continue rising.

I expect bonds to keep rising. Economic growth is facing obstacles.

Ten-year yields have fallen to quite a low level as the concern over a U.S. economic slowdown has grown.

Investors feel there is no need to aggressively buy bonds now as yields may continue climbing amid signs of solid economic growth.

The reduction in sales is a plus for bonds. Investor confidence in the government's ability to manage public debt is increasing.

There is a solid demand for long-term bonds with a 20- to 30-year maturity. Twenty-year yields around 2.2 percent are attractive.