Up here in Canada, the CPI is adjusted from spending surveys: * https://www.statcan.gc.ca/en/survey/household/3508 https://www.statcan.gc.ca/en/survey/househol

Up here in Canada, the CPI is adjusted from spending surveys: * https://www.statcan.gc.ca/en/survey/household/3508 https://www.statcan.gc.ca/en/survey/household/3508 When people change their habits in life the CPI is changed to reflect what that life costs. You can see the list of changes going back to 1913: * https://www.statcan.gc.ca/en/statistical-programs/document/2301_D70_V1 https://www.statcan.gc.ca/en/statistical-programs/document/2... Do you think coal and lard should be included, like they were pre-1956? Or do you think the CPI should try to model reality? Here's the current list of products that StatCan used for Canada's CPI as of August 2022: * https://www.statcan.gc.ca/en/statistical-programs/document/2301_D68_V1 https://www.statcan.gc.ca/en/statistical-programs/document/2... Reality is messy, and you cannot take all of it into account, and so you create models approximations (cf. [spherical cow](https://en.wikipedia.org/wiki/Spherical_cow https://en.wikipedia.org/wiki/Spherical_cow)). But in the words of [Alfred Korzybski](https://en.wikipedia.org/wiki/Map–territory_relation https://en.wikipedia.org/wiki/Map–territory_relation): * [The map is not the territory.](https://en.wikipedia.org/wiki/Map–territory_relation https://en.wikipedia.org/wiki/Map–territory_relation) * https://fs.blog/map-and-territory/ https://fs.blog/map-and-territory/ Or those of statistician George Box: * [All models are wrong but some are useful.](https://en.wikipedia.org/wiki/All_models_are_wrong https://en.wikipedia.org/wiki/All_models_are_wrong)