Graph representing U.S. growth in gross domestic product from 1909 to 1949

Vertical axis represents a log of economic output beginning at 0 and numbering in single digits to the number 8.
Horizontal axis represents years by decade from 1909 to 1949.
The graph shows the portions of output growth that economist Robert Solow attributed to "labor/capital intensity" (the lower one-eight of total growth) and to "technical change" (the upper seven-eights of total growth).