I have thoughts about the benchmarking of the stocks market recently, will dump here some notes.
To adjust for inflation in Switzerland, I use these data:
Landesindex der Konsumentenpreise (LIK):
In the table view, the data can be exported as CSV.
I define the inflation-adjusted index as the index’s value in CHF divided by LIK value for the previous month.
Depending on the time frame, I will use different reference dates for LIK.
The result should reflect the purchasing power of a unit of a reference / market-neutral / index portfolio of stocks.