A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2015; you can also visit the original URL.
The file type is
first place, as I pointed out in Invisible Barrier (p. lM), there are secondary factors, such as the variations in crop conditions and technological advance, which must be added to the primary curve of the investment and profit cycle. I n the second place, in the sentence quoted by Mr. Price from Burns and Mitchell, those authors must, especially in view of their own chart, have meant by the sine curve the simple y = a sin x, whereas in my paper in SCIENCE it is obvious, from my equations anddoi:10.1126/science.117.3039.339 pmid:13048676 fatcat:2k3byknbijgkrbddzucvyg7tgy