It's an attempt to measure relative affordability, part of this is that humans are unable to take a value such as an average inflation rate of 3.4% and work bac

It's an attempt to measure relative affordability, part of this is that humans are unable to take a value such as an average inflation rate of 3.4% and work backwards over 20 years. I'm not sure how useful that number is, however, I'm pointing out that it doesn't add to the invalidity of his argument.