问题如下：
Which type of bond most likely earns interest on an implied basis?
选项：
A.Floater
B.Conventional bond
C.Pure discount bond
解释：
C is correct.
A zero-coupon, or pure discount, bond pays no interest; instead, it is issued at a discount to par value and redeemed at par. As a result, the interest earned is implied and equal to the difference between the par value and the purchase price.
implied bias 是个啥bias？ 我记得在 quant 里有些 bias 类型的探讨，但是在第五本原版书专门讲 FI 的里都找不到啊，除了这个题目里有出现了这个字眼
