[Retric]

The important difference is the inflation rate could differ from its current value. Money 200 months left is unlikely to be worth exactly 10x as much as money with 20 months left. That difference may not be meaningful on its own but could have interesting knock on effects depending on how money enters the system.

[brookst]

That’s true, but how is it different from nonlinear rates of return on bonds of varying lengths?

Changing the way money enters the system is interesting for sure, but orthogonal to whether expiring money is just inflation by another name.

[LouisSayers]

That truly sounds like a nightmare. Imagine going to buy a loaf of bread and being asked "what's your expiry", then being told "your money is no good here" because it only has a week left.