As for what rate to use when compenmsating for differences between year X and now. SOme say to use 3% some 6, some 7. Why not use the change in rent ?
Market rent reflects what people are willing and able to pay monthly for a roof over their heads. It is not subject (directly) to speculation. It reflects supply/demand and people’s ability and willingness to pay. Using market rent regardless of what CPI or shadow stats say about inflation is the best indication of the monthly vlaue of a roof over one’s head at any given point in time.