Used Car Price Index
Hyper-sensitive to credit and inflation — one of the most honest numbers in the CPI basket.
What This Measures
Used cars are financed by a broad cross-section of American consumers — often people who can't qualify for new car loans. That makes the price index unusually sensitive to real credit conditions and inflation pressure on middle-income households. When used car prices move, something meaningful has shifted in the underlying economy.
2021: One Sub-Index Broke CPI
A chip shortage killed new car production in 2021. Buyers flooded the used market. Prices surged more than 30% year-over-year — and used cars alone accounted for a significant fraction of the entire year's CPI increase. A single BLS sub-index moved the official inflation number in ways that felt completely disconnected from what most people were experiencing. It was a useful reminder of how much weight this series carries.
No Smoothing
Used car prices are set by actual transactions at wholesale auctions and dealer lots. No survey methodology, no revision, no smoothing. The Manheim Used Vehicle Value Index — a private benchmark — typically leads the BLS number by about a month, giving analysts a preview of where CPI is heading. When used car prices drop, credit has tightened and demand has pulled back.
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