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Post-Labour Economics

Module 3 — What Could Go Wrong

Lesson 9: The Self-Reinforcing Loop

Last updated: 2026-10-09

Each individual decision to use a cheaper machine instead of a human is perfectly rational. Add them up across a whole economy, however, and you can get a contraction that no single actor wanted. This is the key macro risk of an automation wave.

Lesson 9: The Self-Reinforcing Loop

Blackboard

When sensible choices add up badly

12 min
Concept 1

Microeconomic logic

Any individual firm facing a capable and cheap AI faces a straightforward choice: automate a task and cut costs, or pay more for a human and lose on margin to a competitor that automated. In a competitive market the first choice is nearly compulsory. Nothing about it is irrational. It may even be efficient in the narrow sense.

Concept 2

The aggregate problem

Now imagine every firm in the economy making the same decision at the same time. Each one cuts wages to save cost. The aggregate effect is that households have less money to spend. Less household spending means less revenue for firms. Less revenue means more cost-cutting. The loop feeds itself. Economists call this demand-led contraction; a related mechanism, debt-deflation, was described by Irving Fisher in 1933.

Concept 3

Why it is not automatic

A real economy has several interrupters. Central banks can cut rates and stimulate demand. Governments can tax and transfer. Wages may stop falling at some floor. New kinds of work may appear fast enough to absorb displaced workers. The contraction is a risk, not a certainty — and it is a live debate whether current AI capabilities can trigger it or not.

Concept 4

Why this risk is taken seriously

Three of the world's most-cited economists on this question — Daron Acemoglu, David Autor, and Pascual Restrepo — have documented labour-displacing automation running ahead of labour-augmenting innovation for four decades. The risk in their work is not that machines take all jobs, but that the productivity they generate is so lopsidedly distributed that aggregate demand erodes. Fisher's old warning, in new clothes.

Pause and Think

Name one sector where widespread cost-cutting by firms seems to have hurt aggregate demand. What happened next?

Flashcards

Key Terms

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Additional Resources
Practice Question

Which of the following would most effectively INTERRUPT a demand-contraction spiral of the kind described in this lesson?

Does not count for certificate
Choose one answer, use the hint if needed, then check your answer.
Use the hint before checking if you need a nudge.