Around $500 billion in U.S. Treasuries are traded each day and many countries hold U.S. Treasuries, as they are considered a very safe investment. For example, as of October 2018, Japan held $1,018.5 billion in U.S. Treasuries, and Ireland held $287.3 billion. Use the three types of bond risks to explain why U.S. government bonds are considered such a safe investment. What is the trade-off that accompanies this low risk?