. Economic cycles: their law and cause . Percentage chanie In the yield per acre ofosts Percentage change in the yield per acre of potatoes Figure 21. The relation between the price and the yield per acre of the several crops. When the origin is at (0, 0), the equations are For corn, y = .17 — + .01892^2 — .000137x'. For hay, y = — + .01549x2 + .00009x'. For oats, y = — — + .02324x2 — .000238x3. For potatoes, ?/ = .49 — + .01993x2 — .000141x'.

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