Series Is Presented Here As Two Variables--(1)--Original Data, 1913-1928 (2)--Original Data, 1927-1941. This Series Represents The Average Of Prices Of One Popular Car And Is Available Through 1937. A Revised Index Which Takes Into Account Price Changes In Three Styles Of Chassis (4-Door, 2-Door, And Coupe) Was Available Annually Plus A December Figure During 1927-1936 And Monthly Thereafter. The NBER Has Therefore Adjusted The July 1927-1936 Data In The First Series By The Annual And December Figures In The Revised Series To Make A Continuous Second Segment. Source: Bls Bulletins
This NBER data series m04180a appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04180a
Release: NBER Macrohistory Database
National Bureau of Economic Research, Index of Wholesale Prices of Passenger Automobiles for United States [M0480AUSM336NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M0480AUSM336NNBR/, June 30, 2015.