22 



Generating Economic Cycles 



Index or the Yield of Potatoes 



16,62 



I902 1906 



Index or the Price or Potatoes 



Figure 6 



Secular trends in the index numbers of the yield and price of potatoes and cotton. 



Potatoes: Yield, y = 108.2 + 1.992x + .0179x2 _ .004,435x3, origin at 1899; 



Price, y = 101.6 + 1.612x + .0921x2 — .OOG.lOlx', origin at 1S97. 



Cotton: Yield, y = 101.2 + .548x - .0.331x2 — .001,901x3, origin at 1899; 



Price, y = 111.0 + 2.688x + .1667x2 — .009,536x5, origin at 1897. 



eral crops from their respective secular trends are 

 related to the corresponding percentage variations 

 of prices from the respective secular trends of prices. 

 The method of investigation will be made clearer 



