John Stuart Mill? Henry George? H. L. Mencken? C. Palfrey? J. E. Jennings? Adam Coaldigger? Anonymous?

Question for Quote Investigator: Recent progress in artificial intelligence and robotics has led some to believe that work hours will shrink and leisure will grow. However, history suggests a different possibility.
Brilliant inventors have created a series of remarkable labor-saving devices, yet somehow people seem to be working harder than ever. This notion has been summarized with a trenchant adage:
Labor-saving machinery doesn’t really save labor.
This saying has been attributed to English philosopher John Stuart Mill, U.S. political economist Henry George, and U.S. essayist H. L. Mencken.
This counter-intuitive observation has inspired several possible explanations including the following: Machines allow more goods and services to be produced at lower prices, but this causes the needs and desires of people to grow and expand; hence, working hours have not decreased in several decades.
Would you please explore the provenance of this saying?
Reply from Quote Investigator: This saying can be expressed in many ways; hence, it is difficult to trace. John Stuart Mill articulated the central idea in 1848 although he employed a different phrasing. Here is an overview with dates and attributions:
1848: It is questionable if all the mechanical inventions yet made have lightened the day’s toil of any human being (John Stuart Mill)
1869: All the contrivances of science and art for economy of labor do not save labor, but stimulate production (C. Palfrey)
1885: All the labor-saving machinery that has hitherto been invented has not lessened the toil of a single human being (Attributed to John Stuart Mill by Henry George)
1900: No labor-saving invention has been used to save labor, but to increase it (J. E. Jennings)
1905: Labor-saving devices don’t save labor. They increase it (Anonymous)
1929: Labor-saving devices don’t save labor which is proven by the fact that men never worked as many days per annum or worked as feverishly as they have since the advent of the labor-saving devices (Adam Coaldigger)
1935: The plain fact is that labor-saving machinery doesn’t save labor at all (Howard Vincent O’Brien)
1962: Labor-saving machinery had in fact not saved any labor (Attributed to John Stuart Mill by August Heckscher)
1989: The fact is that a lot of labour-saving devices don’t really save labour (Sue Birchmore)
2008: No labor-saving device has ever saved a minute of labor! (Attributed to H. L. Mencken)
Below are details for selected citations in chronological order.
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