Why do we exclude the price of things like Food, Housing and Energy costs when looking at the total number for inflation?

Question

I’ve been looking for a reasonable explanation for this for a while and literally cannot find one. SO help me understand, please. ❤️🤷‍♀️

In: 42

Answer 1

They don’t, there are two measures, core and non-core. Food and gas e.g. are very volatile and therefore aren’t included in core cpi.