🔍 Read the full analysis: Field, Factory, And Office: A Practical Guide To Job Sectors on ThorstenMeyerAI.com
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TL;DR
ThorstenMeyerAI.com published the first episode of its 60-part Work After Work series on Nov. 2, 2026, introducing the primary, secondary and tertiary sectors as a framework for understanding changes in employment. The source cites historical and modelled estimates showing a long shift from farming toward services, while stressing that sector boundaries vary and that automation becoming a separate sector is the author’s thesis, not an established fact.
ThorstenMeyerAI.com published the first episode of its planned 60-part Work After Work series on Nov. 2, introducing a three-sector framework for tracking how employment has shifted from farming to manufacturing and services. The opening instalment presents historical figures and explains why the categories are useful, while acknowledging that some jobs do not fit neatly into a single sector.
The guide divides work into the primary sector, which takes resources from nature; the secondary sector, which makes or builds things; and the tertiary sector, which provides services. Farming, fishing and forestry are primary activities. Manufacturing and construction are secondary, while trade, transport, health care, education and government are among the service activities in the third category. Mining’s classification varies across statistical systems.
The article cites estimates showing the scale of the shift in the United States. Historian Stanley Lebergott’s figures put farming at 73.7% of the US labor force in 1800, 54.8% in 1850, 40.2% in 1900 and 12.0% in 1950. An International Labour Organization modelled estimate puts the US primary-sector employment share at 1.5% in 2025. These figures use different sources and periods, so the article presents them as a long-run sequence rather than a single continuous measurement.
The source also reports that, in ILO modelled estimates, services have employed more people worldwide than farming since 2001. It cites a decline in China’s primary-sector employment share from 83.5% in 1952 to 22.2% in 2024, and a fall in Japan from 53.8% in 1920 to 3.2% in 2020. The article says US factory employment remains about 35% below its June 1979 peak, while real manufacturing output in 2025 was about 1.9 times its 1979 level.
How the Work Map Helps
The sector model offers readers a simple way to interpret structural change: as production methods and economies change, workers may move between kinds of work even when demand for goods and services continues. That helps explain why a decline in the share of people farming does not mean food production stopped, or that workers vanished; the workforce became concentrated in other activities.
The distinction also matters when discussing automation. Employment counts and output measures can move in different directions: the article’s US figures show fewer factory jobs than at the 1979 peak alongside higher real manufacturing output in 2025 than in 1979. That comparison does not, by itself, establish why employment changed, but it shows why job numbers alone cannot describe the whole economy.
For readers weighing technology’s effects on work, the series frames the central issue as where displaced or newly available workers go. Its longer-term proposition—that automation might eventually be treated as a sector of its own—is explicitly presented as the author’s thesis, not a forecast established by the cited employment data.
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How Economists Built the Categories
The article traces the three-sector framework to work by economists in the 1930s and 1940s. New Zealand economist Allan G. B. Fisher used “tertiary” for services in a book written in 1934 and published in 1935, according to the source. Colin Clark compared employment patterns across countries in The Conditions of Economic Progress, published in 1940, and described movement from agriculture to manufacturing and then commerce and services.
French economist Jean Fourastié developed a further account in a 1949 book, arguing that services could absorb workers released as technology raised productivity elsewhere. The source presents this as an economic argument from that period, not a guarantee that every worker displaced by technological change will find comparable work.
The categories remain statistical tools, not fixed natural boundaries. A software engineer employed by a carmaker, for example, might be counted under manufacturing or services depending on the classification used. Mining is another disputed case: it is often grouped with primary activities, but Clark placed it in the secondary sector and Japan’s current census does so as well.
Where the Sector Lines Blur
The article’s figures come from different historical sources and statistical methods, including Lebergott’s historical estimates and ILO modelled estimates. The source does not provide the full methodology, uncertainty ranges or definitions behind every number, so the figures should not be treated as a perfectly comparable annual series.
Sector labels also differ among countries and over time. The source notes that mining and some work connected to manufacturing can be classified differently. It does not provide a universal rule for resolving those cases, or detailed figures for how many workers are affected by classification choices.
The claim that automation could become its own sector and perform up to 90% of work is identified by the author as a thesis, not a confirmed finding. The article does not establish a timeframe, define what counts as “work” for that estimate or present evidence that would confirm the projection.
The Series Turns to Automation
Work After Work is described as a daily series of 60 episodes about how the economy is built, how work has shifted and which tasks may remain human as machines take on more work. The opening episode establishes the sector framework for later instalments on technologies such as tractors and chatbots.
The source says the author’s automation thesis is scheduled for examination in Episode 48. No publication date for that episode, research method or independent assessment of the proposed 90% figure is provided in the material available. Readers will need those details to judge how the series tests the claim.
Key Questions
What are the three job sectors?
The primary sector takes resources from nature, the secondary sector makes or builds products, and the tertiary sector provides services. Examples include farming, manufacturing and health care, respectively.
What does the article say about US farm employment?
It cites historical estimates putting farming’s share of the US labor force at 73.7% in 1800 and 12.0% in 1950, followed by an ILO modelled estimate of 1.5% for 2025. The figures come from different sources and should not be read as one uniform statistical series.
Does the article say the United States no longer makes things?
No. It says US factory employment is about 35% below its June 1979 peak, while real manufacturing output in 2025 was about 1.9 times its 1979 level. The employment and output measures describe different aspects of manufacturing.
Is automation already a separate economic sector?
The source does not establish that. Treating automation as a sector that could perform up to 90% of work is presented as the author’s thesis, and the article says a later episode will examine it.
Source: ThorstenMeyerAI.com
