Consumer Price Index used by economists often excludes food and energy, believed to be too much volatile to watch inflation numbers. But when I came around that, I had a question about it: I think that main of our costs monthly is food, house & energy. House shouldn't be much concerned by exclusion, but for normal consumer, these two spots are clearly important for their purchase power. Why then economists excludes at the same time one of the most important hotspots for consumers, meanwhile it is one of the most volatile hotspots, this for something measuring the consumer's purchase power? Maybe I'm just "too much logic" (haha!) and market logic is not getting in my way, but still.