When would it be a good investment to sell bonds at a discount from par

Answer: it can be bought for more than $1,000 and is selling at a discount when it can be bought for less than $1,000

Explanation:

There are two primary reasons a bond might be worth less than its listed face value. A savings bond, for example, is sold at a discount to its face value and steadily appreciates in price as the bond approaches its maturity date. Upon maturity, the bond is redeemed for the full face value.