经典习题 individual IPS Reading 32 Risk management for individuals， 第六题
statement 3 If Janice were to add a 10 year period certain option to her annuity, her income yield would be reduced when compared to not having the option, but it would be reduced by greater amounts the longer she waits to purchase the annuity.
我理解了前半句是对的，但觉得后半句(涂红色的)不对，年金越推迟买，income yield 应该增加，不是减少。后半句该怎么理解?
