Would be enlightening to see CPI_n variations, eg:

(1) adj: Housing | Urban vs Rural or Index[a]

(2) adj: Schooling | Univesity Tuition (state or private)[b]

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[a] http://www.census.gov/construction/nrs/pdf/uspricemon.pdf

[b] http://money.cnn.com/2012/10/24/pf/college/public-college-tu...