🔍 Read the full analysis: From Outdoor Work To Office Work: Three Job Sectors on ThorstenMeyerAI.com
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TL;DR
ThorstenMeyerAI.com launched the first episode of a 60-part series on how work and the economy have changed, using the primary, secondary and tertiary sectors as its framework. The episode cites long-term employment shifts from farming toward services, while stressing that the three-sector model is a simplified way to classify work.
The framework divides economic activity into three broad groups: the primary sector takes resources from nature, including farming, fishing and forestry; the secondary sector makes things through manufacturing, construction and energy production; and the tertiary sector provides services, from trade and transport to health care, education and government. The article uses bread to illustrate the categories, from growing wheat to baking it and selling it.
The episode says that, in estimates by economic historian Stanley Lebergott, farming accounted for 73.7% of the US labor force in 1800 and 12.0% in 1950. It also cites the International Labour Organization’s modelled estimate that agriculture accounted for 1.5% of US employment in 2025. These figures come from different sources and periods; the episode presents them as a long-term shift, not a single continuous series.
The account gives international examples: China’s primary-sector share of employment fell from 83.5% in 1952 to 22.2% in 2024, while Japan’s fell from 53.8% in 1920 to 3.2% in 2020. It also says that ILO modelled estimates place 2001 as the year services began employing more people worldwide than farming. Those comparisons depend on the definitions and estimates used.
How Employment Moves Across Sectors
The framework matters because it helps explain a major economic change without implying that work simply vanished when fewer people were needed on farms. The episode’s central account is that workers moved between sectors as production methods changed and new kinds of employment expanded. For readers, the distinction offers a way to make sense of why farming can produce food for a much larger population while employing a smaller share of workers.
The story also challenges a common interpretation of manufacturing’s decline in employment. The source says US factory jobs are about 35% below their June 1979 peak, while real manufacturing output in 2025 was about 1.9 times its 1979 level. Fewer workers, in this account, do not necessarily mean less production. The figures are attributed to the source material; the episode does not provide the underlying series or methods in the supplied text.
That distinction is relevant to current debates over automation. The series frames later episodes as an examination of which work remains human as machines take on more tasks. But the possibility that automation could form its own sector is presented as the author’s thesis for future discussion, not a measured trend or forecast established by the cited historical figures.
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Economists’ Three-Sector Framework
The classification developed during the 20th century. The episode credits New Zealand economist Allan G. B. Fisher with adding the term “tertiary”; his book, written in 1934, was published in 1935. Colin Clark compared sectoral employment across countries in The Conditions of Economic Progress, published in 1940, and described workers’ movement from agriculture to manufacturing and services as a feature of economic progress.
French economist Jean Fourastié argued in 1949 that services would absorb workers displaced as machines increased industrial productivity. His reasoning, as summarized by the episode, was that productivity gains could be faster in manufacturing than in many personal services. The three-sector map remains useful as a broad guide, but it is not applied uniformly: the source notes that mining and software work can be classified differently depending on the statistical system.
““The boxes show where people earn their living, and how that changes over time.””
— Thorsten Meyer, author of the Work After Work episode
Limits of the Employment Comparisons
The source material does not include the full tables, methodology or links supporting all the employment comparisons, so the figures cannot be independently evaluated from the supplied account alone. Historical estimates also cover different populations and use differing classifications: Lebergott’s US series, for example, is described as counting the labor force aged 10 and over, while the 2025 figure is an ILO modelled estimate.
The precise boundary between sectors is not universal. Mining is placed in different categories in some accounts, and a software engineer employed by a car company may be counted as manufacturing or services. The episode’s proposed automation sector is even less settled: it gives no operational definition or supporting measurement, and explicitly labels the idea a personal thesis. Its suggested timeframe—within a decade or a few decades—is speculative.
The Series’ Next Questions
Work After Work is described as a daily series planned for 60 episodes, examining how the economy is built, how work has shifted and which tasks may remain human as machines take on more. The first episode establishes the sector framework; the source says episode 48 will put the author’s automation-sector thesis “on trial.”
The material provided does not give a schedule for individual episodes beyond describing the series as daily, nor does it identify a publication date for episode 48. Readers can expect the series to return to the historical argument over whether new services can absorb workers displaced by technology, but the supplied episode does not settle how future automation will affect employment.
Key Questions
What are the three economic sectors?
The primary sector gathers resources from nature, the secondary sector makes goods or builds infrastructure, and the tertiary sector provides services. The precise classification of some activities can vary across statistical systems.
When did services employ more people worldwide than farming?
The episode says ILO modelled estimates identify 2001 as the year services overtook farming in worldwide employment. The supplied material does not include the underlying data table or definitions.
Does the decline in US factory jobs mean manufacturing output fell?
Not according to the figures cited in the episode. It says factory employment was about 35% below its June 1979 peak, while real manufacturing output in 2025 was about 1.9 times its 1979 level. The source text does not provide the detailed data series.
Is automation already a fourth economic sector?
The episode does not establish that. Its author proposes that automation could become a sector of its own, but labels this a thesis and says a later episode will examine it.
Source: ThorstenMeyerAI.com
