🔍 Read the full analysis: Field, Factory, And Office Jobs: How They Differ on ThorstenMeyerAI.com
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TL;DR
ThorstenMeyerAI.com published the first episode of a 60-part series examining how work is organized and how it changes as machines take on more tasks. It uses the primary, secondary and tertiary sectors—field, factory and office—as a framework, citing historical employment estimates that show a long shift from farming toward services. The source also proposes, as a thesis rather than an established fact, that automation could eventually form a sector of its own.
ThorstenMeyerAI.com published the first episode of a planned 60-part series on how economies organize work, using the familiar division into primary, secondary and tertiary sectors—or field, factory and office jobs. The episode charts the movement of workers away from farming and toward manufacturing and services, while presenting a possible automation sector as the author’s thesis, not a confirmed forecast.
The three categories describe the main kind of activity involved. The primary sector gathers resources from nature, including farming, fishing and forestry; mining is commonly included, although classifications differ. The secondary sector makes or builds things, including manufacturing, construction and energy supply. The tertiary sector provides services, from trade and transport to health care, education, government and office work.
The source uses bread to illustrate the distinction: growing wheat is primary work, milling and baking it in a plant are secondary work, and transporting or selling it are services. The categories can be blunt and inconsistent. For example, a software engineer employed by a carmaker may be counted in manufacturing in one statistical system and services in another.
The episode cites historical estimates showing a major change in employment. Stanley Lebergott’s figures put farming at 73.7% of the US labor force in 1800, 40.2% in 1900 and 12.0% in 1950. The International Labour Organization’s modelled estimate for 2025 puts the US figure at 1.5%. The source also reports that, in the ILO’s modelled estimates, services have employed more people globally than farming since 2001.
Why Work Moved Beyond Farming
The sector model offers readers a way to understand a basic economic change: as farming and manufacturing became more productive, a smaller share of workers could produce the same or greater amounts, while employment expanded in other areas. The figures cited in the episode show that this was not only a US development. In China, the primary sector’s share of employment fell from 83.5% in 1952 to 22.2% in 2024, according to the source; Japan’s census recorded a decline from 53.8% in 1920 to 3.2% in 2020.
That history is relevant to current arguments about automation and jobs. The episode’s framework points readers toward a key question: when machines reduce the amount of human labor needed for a task, where does employment go next? The historical pattern shows movement among sectors, but by itself it does not establish what will happen to particular workers, occupations or wages in the future.
The article also challenges the broad claim that the United States no longer makes goods. 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. Those figures have different measures: fewer factory jobs do not, on their own, mean less manufacturing output.
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Origins of the Three-Sector Map
The framework took shape in the first half of the 20th century. New Zealand economist Allan G. B. Fisher used the term “tertiary” in a book written in 1934 and published in 1935, according to the episode. Colin Clark later quantified the shift among sectors in The Conditions of Economic Progress, published in 1940. Clark described movement from agriculture to manufacturing and then to commerce and services as a major accompaniment of economic progress.
French economist Jean Fourastié added an account of how technology might shape that movement in a 1949 book. He argued that productivity gains would arrive at different speeds in different sectors and that services could absorb workers released by mechanization elsewhere. The episode treats that argument as an idea to examine across the series, not as proof that displaced workers will always find new jobs.
Its historical comparisons also need to be read with their stated limits. The US figures attributed to Lebergott cover the labor force aged 10 and over and come from a historical series published by the US Census Bureau in 1975. The 2025 ILO number is a modelled estimate. Differences in dates, definitions and statistical methods mean the figures are not all drawn from one directly comparable dataset.
““Three boxes. The primary sector takes things from nature; the secondary sector makes things; the tertiary sector serves people.””
— Thorsten Meyer, author of the ThorstenMeyerAI.com episode
Limits of the Sector Categories
The three-sector map is an organizing tool, not a universal classification. Mining and cross-sector occupations can be assigned differently by national statistical systems, complicating comparisons. The source does not provide enough detail to reconcile every historical series or explain how changes in survey methods affect each country’s figures.
The episode’s automation projection is especially uncertain. Its suggestion that machines could perform up to 90% of work without human hands is explicitly the author’s thesis; the source does not establish a timeframe, define precisely what counts as a sector, or provide evidence that the forecast will occur. Nor does the historical shift into services show that future workers will move smoothly into new roles.
Next Episodes Examine Work
The source describes this as the opening episode of Work After Work, a daily series planned to run for 60 episodes. It says later installments will examine how work has moved and which tasks may remain human as machines take on more of them. A planned episode 48 is described as putting the author’s automation-sector thesis on trial.
No publication schedule beyond the daily-series description is given in the supplied material. Readers can follow the series for further discussion, but the current episode does not offer a confirmed forecast for employment or a policy response to automation.
Key Questions
What are field, factory and office jobs?
They are shorthand for the primary, secondary and tertiary sectors: extracting or growing resources, making or building goods, and providing services. The categories describe broad types of economic activity, not fixed job titles.
When did services overtake farming as a global employer?
The episode says that, according to the ILO’s modelled estimates, services have employed more people worldwide than farming since 2001. It does not provide the underlying series or a detailed comparison of the estimates.
Does the source say the United States has stopped manufacturing?
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 source uses the figures to distinguish employment from output.
Is automation becoming a fourth economic sector?
That is the author’s thesis, not a confirmed development. The episode proposes that automation could become a sector of its own, but supplies no evidence establishing that this will happen.
Source: ThorstenMeyerAI.com
