Data Represent The Ratio Of The Number Of Placements To Unfilled Applications, On A 1926=100 Base, Adjusted For Season. Allowance Was Made For A Change In The Ratio Construction In February, 1927 That Thereafter Included Aided Unemployed With Unfilled Applications. In 1928 This Change Was Modified By Adjusting For A Three Month Moving Average. Foreign Labor, Which France Purposely Imported, Is Covered By The Data. Source: Ministire De Travail, Statistique Generale, For 1920-1931 Data: Indices De Generaux De Movement De Economique De France, 1931, Pp. 103, 156; For 1932-1938 Data: Bulletin De Statistique Generale. This NBER data series m08024aa appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html. NBER Indicator: m08024aa

This Index Covers 47 Of The Largest Of 149 Labor Market Areas Listed As "Labor Market And Employment Security." Source: G.H. Moore, Business Cycle Indicators, Vol. 2, NBER, P. 157 This NBER data series m16081 appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html. NBER Indicator: m16081