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TL;DR
The source introduces the primary, secondary and tertiary sectors as a framework for grouping work in the economy. Historical and modelled employment figures show a long shift from farming toward services, though sector boundaries vary and the categories are a simplified map, not a complete account of every job.
ThorstenMeyerAI.com published the first episode of a planned 60-part series on how economies and work change, using the primary, secondary and tertiary sectors to explain the movement of workers from farming to manufacturing and services. The episode presents the framework as a useful but simplified way to track employment shifts, not a rule that neatly classifies every job.
The three-sector model groups work according to what it produces. The primary sector takes resources from nature, including farming, fishing and forestry; mining is included in many classifications, but not all. The secondary sector makes or builds things, including manufacturing, construction and energy supply. The tertiary sector provides services, from transport and retail to health care, education, government and office work.
The source illustrates the categories with bread: growing wheat is primary work, milling flour and baking at a plant are secondary work, and transporting or selling the bread are services. It also notes that boundaries can be inconsistent. A software engineer working for a carmaker, for example, may be classified as part of manufacturing in one set of statistics and services in another.
The episode cites employment figures to show the scale of change. In estimates by economic historian Stanley Lebergott, farming accounted for 73.7% of the U.S. labor force in 1800, falling to 12.0% in 1950. The source gives an International Labour Organization modelled estimate of 1.5% for 2025. It also says the ILO’s modelled estimates place the point when services employed more people worldwide than farming in 2001.
How Work Shifted Beyond Farming
The figures help explain why a modern economy can produce food without employing most workers on farms. Mechanization and economic change have accompanied a long reallocation of labor: from agriculture into factories and, later, into services. That shift affects how people find work, what skills employers need and how governments understand economic growth.
The framework also matters to current debates about automation. The source connects the history of workers moving between sectors with questions about whether machines will displace jobs and where workers might go next. That is a framing for the series, not a finding that automation will produce any particular outcome. The episode’s forecast that automation could become a sector of its own is explicitly presented by its author as a thesis, not an established fact.
The source also challenges the claim that the United States no longer makes things. It reports that U.S. 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 comparison shows why job numbers and production are different measures: output can rise even as factories employ fewer people.
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Where the Three-Part Map Came From
The categories were developed to describe economic change, rather than to provide a perfect label for every occupation. The source traces the terms “primary” and “secondary” to statistical usage in Australia and New Zealand in the early 20th century. New Zealand economist Allan G. B. Fisher added “tertiary” in work written in 1934 and published in 1935, according to the account.
Economist Colin Clark compared employment patterns across countries in his 1940 book, helping give the framework a quantitative basis. The source says Clark observed that industry’s share of employment did not increase indefinitely: it rose to a peak and then declined. French economist Jean Fourastié later argued that services could absorb workers freed by technological progress in industry. These are historical arguments about economic development; they do not establish that every displaced worker will find new work.
The series is titled Work After Work and is planned to run for 60 episodes. This opening instalment uses the sector model as a starting point for later discussions of technology, employment and the kinds of work that remain human as machines take on more tasks.
“The prediction that automation could become a sector of its own is presented as “my thesis, not a fact.””
— Thorsten Meyer, author of the series
Where Sector Boundaries Blur
The model’s categories are broad, and the source acknowledges that statistical agencies do not always classify activities in the same way. Mining is a clear example: it is often grouped with primary work, while Clark’s classification and Japan’s census place it in the secondary sector. Some jobs also combine activities or fall under different categories depending on the dataset.
The figures cited come from different sources, periods and methods. Lebergott’s historical U.S. estimates cover the labor force aged 10 and older, while the 2025 ILO figure is described as a modelled estimate. They should not be treated as one uninterrupted series without checking their definitions. The source excerpt also does not provide full methodological details for all international comparisons, including the precise coverage and comparability of the China and Japan figures.
It is also unclear what automation will do to employment across sectors. The claim that it could perform up to 90% of work with no human hand is presented as the author’s thesis, and the excerpt does not specify the measure, time horizon or evidence behind that estimate. It should not be read as a confirmed forecast.
The Series Turns to Automation
The series is scheduled to continue with further episodes on how economies are built and how work changes as technology develops. According to the source, episode 48 will examine the author’s automation thesis. That is a planned editorial milestone, not a reported research result or a scheduled policy decision.
For readers assessing the argument, the next useful steps are to compare sector figures only when their definitions, dates and methods are clear, and to distinguish measured employment changes from predictions about future automation. The source does not provide a publication calendar for the remaining episodes or additional evidence supporting its forecast.
Key Questions
What are the three sectors?
The primary sector takes resources from nature, the secondary sector makes or builds goods, and the tertiary sector provides services.
Why can the same job be placed in different sectors?
Classifications differ in how they define an industry and its activities. The source notes that mining is not always assigned to the same sector and that a software engineer at a carmaker could be counted as manufacturing or services, depending on the statistics.
What does the source say about the U.S. move away from farm work?
It cites Lebergott’s estimates that farming’s share of the U.S. labor force fell from 73.7% in 1800 to 12.0% in 1950, and an ILO modelled estimate of 1.5% for 2025. The figures come from different sources and periods.
Does the episode prove automation will replace most work?
No. The source labels the prediction that automation could perform up to 90% of work as the author’s thesis, not a fact. The excerpt does not give the measure or evidence needed to treat it as a confirmed forecast.
Source: ThorstenMeyerAI.com
