Obsolete jobs show how technology deletes entire roles

Jobs like “knocker-ups” and “powder monkeys” did not disappear gradually; they vanished when a cheaper alternative became reliable at scale. Business Insider traces 20 once-common occupations—ice cutters, pinsetters, leech collectors, “badgers” who bought farm goods to resell at market—using old occupational classifications and historical reporting. At the industry’s peak in the 19th century, the US ice trade employed roughly 90,000 people; by the time refrigerators and freezers became standard household equipment in the mid-20th century, the job category had little left to do.

The list reads like a tour through the frictions of pre-modern life. A knocker-up—essentially a paid human alarm clock—existed because punctual factory work arrived before cheap clocks did. Pinsetters—often boys—stood behind bowling lanes because the game’s economics depended on fast resets before mechanical setters were invented and standardised. Leech collectors thrived during medicine’s bloodletting era, not because the work was inherently valuable, but because the prevailing theory made it billable.

What ties these roles together is not “progress” in the abstract but the moment when measurement, standardisation, and liability shifted. Refrigeration did not just replace muscle; it replaced an entire logistics chain of harvesting, storing, and transporting ice, collapsing a seasonal labour market into a manufacturing and retail one. Mechanical pinsetters did not merely speed up bowling; they changed the unit economics of a lane, turning labour costs into capital costs and making higher throughput the default expectation.

The same pattern is now visible in white-collar work that exists mainly to bridge gaps between systems: routine customer service, basic scheduling, entry-level reporting, and document handling. These jobs persist where errors are hard to price and responsibility is diffuse—where it is cheaper to hire a person than to redesign a process. When a tool becomes dependable enough that a manager can be held to a service level agreement, the “human workaround” becomes a cost centre.

Business Insider notes that today’s labour market anxiety is being driven by rapid deployment of AI tools and predictions that automation will reach beyond office work. The historical record suggests the decisive factor will be less about capability in demos and more about who bears the cost of mistakes. When the cost is internalised—by a firm, a supplier, or an insurer—workarounds tend to be engineered away.

In the 1800s, people paid someone to tap on a window so they would not miss a shift. In 2026, the question is which modern roles exist mainly because nobody has yet made the system accountable enough to run without them.