section_path: Causes/Heterodox theories/Productivity shock
section_name: Productivity shock
paragraph_text: Productivity shock
  
  It cannot be emphasized too strongly that the trends we are describing are long-time trends and were thoroughly evident before 1929. These trends are in nowise the result of the present depression, nor are they the result of the World War. On the contrary, the present depression is a collapse resulting from these long-term trends.
  
  The first three decades of the 20th century saw economic output surge with electrification, mass production, and motorized farm machinery, and because of the rapid growth in productivity there was a lot of excess production capacity and the work week was being reduced. The dramatic rise in productivity of major industries in the U.S. and the effects of productivity on output, wages and the workweek are discussed by Spurgeon Bell in his book Productivity, Wages, and National Income (1940).