🔍 Read the full analysis: The Workplaces That Organize Jobs Into Three 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, explaining how economists group jobs into primary, secondary and tertiary sectors. The episode uses historical and modelled employment figures to describe the shift from farming toward manufacturing and services, while presenting a possible automation sector as 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, using the three-sector model to explain how employment has shifted from agriculture to manufacturing and services. The installment matters as a framing piece for the series’ later coverage of technology and work, but its suggestion that automation could become a sector of its own is explicitly the author’s thesis, not a confirmed economic development.
The episode groups economic activity into three broad categories: the primary sector, which takes resources from nature, including farming, fishing and forestry; the secondary sector, which makes goods and includes manufacturing, construction and energy; and the tertiary sector, which provides services such as trade, transport, health care, education and government. The author uses bread as an example: growing wheat is primary work, processing it is secondary work, and transporting or selling it is tertiary work.
The article says the boundaries are not always consistent. Mining, for example, is counted as primary activity in many classifications but as secondary in Colin Clark’s 1940 framework and in Japan’s current census, according to the source. Some jobs also cross categories: a software engineer employed by a carmaker may be classified as manufacturing in one statistical system and services in another. The model is a broad way to describe where people work, not a precise classification for every job.
The installment cites historical estimates showing a long decline in agriculture’s share of employment. In Stanley Lebergott’s estimates for the United States, farming accounted for 73.7% of the labor force in 1800, 54.8% in 1850, 40.2% in 1900 and 12.0% in 1950. The article gives the International Labour Organization’s modelled estimate for 2025 as 1.5%. It also reports that the primary sector’s share of employment in China fell from 83.5% in 1952 to 22.2% in 2024, and that Japan’s census recorded a decline from 53.8% in 1920 to 3.2% in 2020. These figures describe different countries, periods and source series.
What the Sector Shift Shows
The three-sector framework gives readers a compact way to understand a major change in the composition of work: fewer people are employed directly in agriculture, while employment has expanded in other parts of the economy. The cited figures show that this change occurred across very different national histories, though the pace and timing varied. The article says that, in the ILO’s modelled estimates, services employed more people worldwide than farming from 2001.
That shift is relevant to the series’ central subject: how changes in technology and productivity affect the kinds of jobs people do. The episode presents a historical argument that workers displaced or no longer needed in one sector can move into another. But the sector totals alone do not show whether workers moved directly between industries, how job quality changed, or whether every displaced worker found comparable work. Those questions require evidence beyond the broad employment shares cited here.
The article also challenges the claim that the United States no longer makes goods. It reports that 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 contrast matters because employment and output measure different things: fewer factory workers do not, by themselves, establish that manufacturing production has disappeared.
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How Economists Built the Model
The source traces the three-part framework to economists writing in the 1930s and 1940s. It says Allan G. B. Fisher used the term “tertiary” in a book written in 1934 and published in 1935. Fisher had described a movement from primary activities into secondary and, to a greater extent, tertiary production. The article says the terms “primary industry” and “secondary industry” were already used in Australia and New Zealand statistical practice.
Colin Clark compared employment patterns across countries in The Conditions of Economic Progress, published in 1940. As the episode recounts it, Clark described movement from agriculture to manufacturing and then to commerce and services as a significant accompaniment to economic progress. He also observed that industry’s employment share could rise and later fall rather than increasing without limit.
French economist Jean Fourastié offered another account in a 1949 book: technical progress, he argued, moved at different speeds across sectors, and services could absorb workers made redundant by productivity gains elsewhere. The episode presents this as a historical argument, not proof that future job losses will always be offset. It says the series will return to that question when it examines automation.
Limits of the Sector Evidence
The source gives a broad account of employment change but does not provide the full underlying tables, definitions or methods for every figure in the excerpt. The historical US figures come from Lebergott’s estimates, while the 2025 US figure is an ILO modelled estimate; they are not one uninterrupted series produced using a single method. The China and Japan figures also cover distinct time spans and statistical systems, so they should not be read as directly interchangeable measurements.
The episode’s proposed future automation sector is explicitly labelled the author’s thesis: automation could, within a decade or a few decades, perform up to 90% of work without a human hand. The source does not establish the definition of “work” used for that estimate, the evidence behind it, or how such a sector would be measured. It says a later episode will put the idea on trial. The excerpt also does not establish how technological change will affect total employment, wages or the distribution of work.
The Series Turns to Automation
Work After Work is described by ThorstenMeyerAI.com 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 of them. The first installment sets out the sector framework the series plans to use. The source says Episode 48 will examine the automation-sector thesis; it does not provide a publication date for that installment in the supplied material.
The next developments to watch are the series’ evidence and definitions: how it distinguishes tasks from jobs, what it means by automation performing a share of “work,” and whether it supports the proposed figure with research. Until those details appear, the suggested new sector remains a forecast for debate rather than a documented change in how employment is classified.
Key Questions
What are the three sectors in the article?
The primary sector extracts or grows resources from nature; the secondary sector makes goods and includes construction and energy; and the tertiary sector provides services such as transport, trade, education and health care.
What did ThorstenMeyerAI.com announce?
It published the first episode of Work After Work, a series described as having 60 daily episodes on economic change, employment and automation.
When did services employ more people worldwide than farming?
The source says the ILO’s modelled estimates place the crossover in 2001. The supplied material does not include the underlying global employment table or further methodological details.
Is automation already a fourth economic sector?
No such change is established in the article. The possibility that automation could become a sector is identified as the author’s thesis, and the source says a later episode will examine it.
Does fewer factory employment mean the United States makes less?
Not by itself. The article reports factory employment about 35% below its June 1979 peak and real manufacturing output in 2025 about 1.9 times its 1979 level. Those figures track different measures: the number of workers and the inflation-adjusted value of output.
Source: ThorstenMeyerAI.com
