RELATIONSHIP of WEEKLY WAGE RATE, HOURS WORKED PER 
WEEK, AND UNIT PRIME COST 
230C 
250 
INDEX NUMBER (1914 = 100) 
EEKL' WAGE RATE 
20( 
= 
su 
£9 
15¢ 
INIT PRIME COS 
OC 
RB ( 
A 
1914 
YOURS PER WEE 
1919 1920 192 1922 (923 1924 1925 1926 
CHART 17.—While the weekly wage rate increased from 1921-1928, unit prime cost diminished, due to 
the more economical use of materials and labor and increased efficiency in output.