Generating Cycles of Products and Prices 21 



IMOEX Of THE Yield Of Oms 



A62 1^86 16:90 16^ 1^98 IS(Oa I9.06 I9.10 19.14 1910 



pa 16,66 ie.90 IB,9A 16,90 19,02 l9,Ofe I9,>0 I9,IA 



Index of the Price or Hay 



Figure 

 Secular trends ia the index numbers of the yield and price of oata and hay. 

 Oats: Yield, y = 105.7 + .805j + .02.JSx2 — .000,038x5, origin at 1899; 



Price, y = 100.6 + 1.700j; + .1692^2 — .005,271j3, origin at 1897. 

 Hay: Yield, y = 104.9 + l.l.iGj; - .0049x2 _ .001,816x', origin at 1899; 



Price, y = 103.1 + l.GOGx + .1882x2 - .004,042x', origin at 1897. 



1880 to 1918, and the prices, owing to the abnormal 

 fluctuations during the war, only from 1880 to 1914. 



The next step in the inquiry is to determine whether 

 the percentage variations of the yields of the sev- 



