Net discount rate including growth

CFA Level III Fixed Income
#1

I have only found it mentioned as blurbs in two questions in the book from Reading 12. CFAI has it as:

i = ((1+ Discount Rate)/(1 + Growth Rate)) - 1

I can’t find it anywhere in the reading or other topics. Anyone know if it is? Seems important

#2

5.2.2. Program Review R12

Life Insurance Needs For Jacques and Marion (blue box)

This may help

#3

Does anyone know why we divide the discount rate by growth rate? Can’t wrap my head around that. Can we assume the discount rate to be (inflation + salary growth)? Thank you in advance.

#4

See if this helps: