The Cobra Effect
How an initiative to curb the cobra population instead caused it to explode.
3 min read · from UNINTENDED by Mayank Mehta
In the early 1900s, the British administrators running Delhi had a problem that no amount of paperwork could solve. Cobras. They were everywhere. Slithering through market stalls, coiling under doorsteps, turning up in places that made even seasoned colonial officers uneasy. Delhi, by any reasonable measure, had too many snakes.
So the authorities did what administrators always do. They designed a system. A bounty program: bring in a dead cobra, collect a reward. Simple. Elegant. Aligned incentives with outcomes. For a few months, it worked beautifully. Locals arrived at government offices carrying dead cobras by the dozen. The streets seemed quieter. Reports of sightings dropped. The bureaucrats congratulated themselves.
Then the numbers got strange.
Dead cobras kept arriving, but the population wasn't shrinking. If anything, it seemed stable, maybe even growing. Officials couldn't explain it. The program was clearly popular. People were participating. The math should have worked.
It didn't, because the British had made an assumption that felt so obvious it never occurred to them to question it: that every dead cobra turning up at their offices had once been a living cobra in Delhi's streets.
It had not.
Enterprising locals had figured out something the administrators hadn't considered. Why risk your life hunting wild cobras in dark alleys when you could breed them in your backyard? It was safer, faster, and far more profitable. A small cottage industry had quietly emerged, not to solve the cobra problem, but to farm it.
When the British discovered what was happening, they shut the program down immediately. And that's when the real disaster began. The breeders, suddenly stuck with cages full of cobras and no one to buy them, did the only rational thing available to them.
They opened the cages.
Overnight, Delhi's cobra population didn't just return to where it had been before the bounty. It exploded past it. The city now had more cobras than when the whole effort started, courtesy of the very program designed to eliminate them.
Economists would later give this a name: the Cobra Effect, coined by German economist Horst Siebert in 2001. It describes any well-intentioned incentive that produces the opposite of what it was meant to achieve. Historians have since questioned whether the cobra breeding actually happened as the story describes. A 2025 investigation found no contemporary records of breeding operations in British India, and an 1887 inquiry had concluded that breeding cobras in captivity was highly improbable. But the principle the parable illustrates has been observed so many times elsewhere, in so many different contexts, that it endures whether or not every detail of its origin does.
The reason the Cobra Effect keeps recurring, in policy, in business, in technology, is almost always the same. The designers of the system imagined one kind of person responding to their incentive: the compliant kind, the cooperative kind, the kind who plays the game as intended. They forgot about the other kind. The kind who looks at the rules not as boundaries, but as raw material for a better strategy.