"The CPI represents changes in prices of all goods and services purchased for consumption by urban households. User fees (such as water and sewer service) and sales and excise taxes paid by the consumer are also included. Income taxes and investment items (like stocks, bonds, and life insurance) are not included."
There you have it. the CPI only includes "out-of-pockets". Big ticket items like federal and state income taxes, state and local property taxes, healthcare costs (including prescription drugs), education costs, etc. aren't included.
why?
Mark Twain said it all: "Figures don't lie, but liars figure."
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