The broken window fallacy is the illusion that destruction is a source of wealth, because it gives work to whoever repairs it. Stated by Frédéric Bastiat in 1850, it recalls a simple truth: replacing what has been destroyed enriches no one; it merely shifts a spending.
1 What is the fallacy?
When repairing passes for getting richer.
Definition
The illusion of useful damage
The fallacy is to believe that damage stimulates the economy, on the grounds that it creates activity to repair it. We look only at that visible activity, forgetting that the money spent repairing would have served elsewhere. Frédéric Bastiat named it in 1850 in "What is seen and what is not seen." It is one of the most stubborn errors of popular economics, resurfacing after every disaster or war.
2 The parable
One window, two readings.
Bastiat's story
①
The broken pane. Jacques Bonhomme's son breaks a window. The neighbors console themselves: at least it gives the glazier a living.
②
What is seen. The glazier receives six francs and spends them in turn: activity seems revived, everyone rejoices.
③
What is not seen. Those six francs will not go to the cobbler or the bookseller. Jacques has a window again, but no longer his six francs: he is the poorer by that much.
3 What is not seen
The essential is in the shadow.
The hidden cost
Opportunity cost
The key to the fallacy is opportunity cost: any resource used for one thing cannot be used for another. The repair spending is visible; the goods that could have been bought instead are invisible, but very real. To tell activity, what is seen and counted (the flow, GDP), from wealth, what is not always seen (the stock, the estate), is at the heart of economic analysis.
4 The limits
Is the fallacy always right?
The Keynesian caveat
An objection exists. In a deep slump, when factories stand idle and hands are unemployed, a spending, even on repairs, can put idle resources back to work without sacrificing anything elsewhere: that is the Keynesian argument. But it has its limits: as soon as the economy runs at full capacity, opportunity cost returns and destruction is again a net loss. The parable does not say that all spending is vain, but that destruction itself never enriches.
5 Takeaways
To remember.
✓
Destruction creates no wealth: it merely shifts a spending.
✓
Tell what is seen (activity) from what is not seen (opportunity cost).
✓
Activity is not wealth: an economy can bustle while growing poorer.
This notion illuminates an analysis
First published: 17 June 2026