Two lenses, one economy
Microeconomics looks small — a single firm, a single market, how one buyer and one seller settle on a price. Macroeconomics looks wide — growth, employment, inflation, interest rates for a whole country. Same economy, two zoom levels. AI is pulling on both at once.
The micro shift — the cost of thinking falls
For two centuries automation drove down the cost of physical work. AI drives down the cost of cognitive work — drafting, analysis, code, support, design. When the marginal cost of a task falls toward zero, micro consequences follow fast: prices on AI-heavy services drop, a small team can produce what once needed a large one, and the value of a worker shifts from doing the task to directing and checking the system that does it. Firms get smaller per unit of output; the bottleneck moves to judgment, taste, and accountability.
The macro shift — the growth and jobs question
Scale those micro changes to a whole economy and the open questions are big ones. Productivity: if AI raises output per worker broadly, it can lift growth the way electricity and the computer did — but past general-purpose technologies took years to show up in the numbers. Employment: tasks are automated faster than whole jobs; the real story is roles being recomposed, with new work appearing alongside displacement. Inequality: gains can concentrate with whoever owns the models and the data. Policy: central banks and regulators now have to weigh an AI productivity boom against labour-market churn.
What genuinely changes
- Pricing — AI-delivered services trend cheaper; scarcity moves to what AI cannot do.
- The firm — smaller, faster teams; leverage per person rises sharply.
- Labour — value shifts from execution to direction, verification, and responsibility.
- Growth — a plausible productivity lift, but with a lag and an uneven spread.
The honest summary
AI does not throw out economics — supply, demand, scarcity and incentives still rule. It moves what is scarce. Routine cognitive output becomes abundant and cheap; judgment, trust, real-world data and accountability become the expensive, valuable things. Read both lenses together: the micro changes are already visible in how firms operate, and the macro effects are the slower, larger story still being written.