AI tools can eliminate many jobs for a few reasons.
First, they lower the cost of doing cognitive work. In the past, automation mainly replaced physical, repetitive factory tasks. AI can now help do parts of writing, customer service, coding, design, analysis, scheduling, research, and back-office work. That means companies can get the same output with fewer people in some roles.
Second, AI hits task bundles, not just single tasks. A job is usually made up of many smaller tasks. If AI automates 30% to 70% of those tasks, a company may not need to fully replace every worker, but it may need fewer workers overall. That is how job reduction often happens in practice.
Third, AI spreads faster than older technologies. Software can be deployed across millions of workers almost instantly. A new factory machine used to require buying equipment, building plants, and retraining staff over years. AI can often be added through a browser, an app, or an API. That makes adoption much faster.
Fourth, AI affects both high-skill and lower-skill work at the same time. Earlier waves of automation often hit narrower categories. AI can pressure entry-level white-collar jobs, support roles, clerical work, and some professional work all at once. That broad reach is why people are worried.
On your second question: not necessarily because it is already larger and faster than any time in previous history. The stronger claim is this:
It has the potential to displace workers unusually broadly and quickly compared with many past technologies.
But we do not yet know that it will be the single biggest or fastest job disruption in all history. Past disruptions were enormous too, such as mechanized agriculture, industrialization, and computerization. Those changes eliminated huge categories of work, but they also created new ones over time.
What makes AI feel different is:
speed of deployment
impact on knowledge work
ability to improve itself rapidly through better models and tools
low cost of copying software once built
So the concern is less “this is already the biggest job loss event ever” and more “this could outpace society’s ability to retrain and reallocate workers.”
The real danger is when three things happen together:
jobs disappear faster than new ones appear,
workers cannot retrain fast enough,
the gains go mostly to the owners of the technology rather than displaced workers.
That is when you get wage pressure, unemployment, and social instability.
So the best one-sentence answer is:
AI may eliminate many jobs because it can automate a wide range of mental tasks cheaply, at scale, and very quickly, which could reduce labor demand faster than workers can adapt.
