Perverse Incentives: Cobra Bounties, Rat Tails and Goodhart's Law

SPEAKER_1 (0:00)

So, back in the late 1800s, Mark Twain's wife, Olivia, had this massive fly problem.

SPEAKER_2 (0:06)

Oh, in their house in Connecticut, right?

SPEAKER_1 (0:08)

Yeah, exactly, just flies everywhere. So she did what any logical, resourceful person would do to fix it. She offered her kids a cash bounty for every dead fly they produced.

SPEAKER_2 (0:18)

Which, I mean, sounds like totally standard parenting logic, cause and effect.

SPEAKER_1 (0:22)

Right, you pay for dead flies, you get a clean, pest-free house. But what she actually got was, well, an indoor, child-run, fly-breeding agricultural empire.

SPEAKER_2 (0:33)

Because, of course, that is completely logical from the perspective of a kid trying to maximize their allowance.

SPEAKER_1 (0:37)

Exactly. The kids immediately realized that if they just kill the flies they happened to see buzzing around, their income stream would eventually just dry up. Oh, wow.

SPEAKER_2 (0:46)

So they saw the ceiling on their profits.

SPEAKER_1 (0:48)

Yeah.

So to keep the cash flowing, they actively began breeding flies in the house. Like, they turned a minor annoyance into a massive household pest problem, all because the financial incentive practically demanded it.

SPEAKER_2 (1:00)

It's hilarious, but it perfectly captures this really frustrating reality about human nature. People will almost always optimize for the specific metric you reward rather than the broader goal you intended to achieve.

SPEAKER_1 (1:14)

That is our mission today. In this deep dive, we're pulling from a massive stack of sources, specifically a comprehensive encyclopedia overview, detailing the fascinating, often hilarious, and sometimes disastrous world of what economists call perverse incentives.

SPEAKER_2 (1:30)

It's such a great topic.

SPEAKER_1 (1:31)

It really is. We are going to unpack exactly why well-intentioned plans, policies, and rewards so frequently backfire, and how you, listening right now, can learn to spot these structural traps hiding in plain sight in your own life.

SPEAKER_2 (1:45)

So just to give a formal definition here, a perverse incentive is basically an incentive structure that produces unintended, undesirable outcomes that actively work against the designer's original intent.

SPEAKER_1 (1:55)

Right, like the flies.

SPEAKER_2 (1:57)

Exactly. You try to reduce the population, you end up multiplying it. Or you try to make something safer and you accidentally make it significantly more dangerous.

SPEAKER_1 (2:03)

Which brings us to the namesake of this entire concept. If you've heard of this phenomenon before, you've probably heard it called the Cobra Effect.

SPEAKER_2 (2:12)

Oh yeah, coined back in 2001 by an economist named Horst Siebert. It is like the classic textbook illustration of this exact problem.

SPEAKER_1 (2:22)

Right, and the story usually goes like this. During the British Raj, the colonial government in Delhi was terrified of venomous Indian cobras.

SPEAKER_2 (2:30)

Which is fair or not?

SPEAKER_1 (2:32)

Sure, very fair. So they offer a cash bounty for every dead cobra. At first, it's a huge success, but then the locals realize they can just breed cobras for the cash.

SPEAKER_2 (2:41)

The fly empire all over again?

SPEAKER_1 (2:43)

Exactly, and the government eventually catches on, they cancel the bounty, and the breeders who now have all these worthless snakes just release them into the wild.

SPEAKER_2 (2:50)

Making the problem so much worse.

SPEAKER_1 (2:52)

Right, so Deli ends up with way more cobras than they started with. It's a neat, highly cinematic story. But I was looking through our sources, and I'm genuinely confused here. Isn't there like a massive hole in this historical narrative?

SPEAKER_2 (3:04)

There is a massive hole, yeah.

And it really highlights a deep irony about how we accept historical anecdotes. A 2025 investigation by the Friends of Snakes Society actually dug into the historical archives from British India to verify this whole thing.

SPEAKER_1 (3:19)

And what did they find?

SPEAKER_2 (3:20)

Absolutely nothing.

SPEAKER_1 (3:21)

Wait, like zero copper farms?

SPEAKER_2 (3:23)

Zero. No breeding operations, no massive snake releases, no prosecutions for fraud.

The investigators actually traced the entire story back to an 1873 newspaper article that used entirely speculative language.

SPEAKER_1 (3:38)

Like just guessing it could happen?

SPEAKER_2 (3:39)

Yeah. Literally saying it was alleged that people might do this. And furthermore, an 1887 inquiry by the Bombay Natural History Society had looked to these exact rumors and concluded that greeting cobras in confinement was highly improbable and had never actually been documented.

SPEAKER_1 (3:55)

So if there was no massive fraud going on, why did the British cancel the bounty program in the first place?

SPEAKER_2 (4:01)

The math simply didn't work in their favor. The program was just way too expensive to maintain, so they scaled it back. It wasn't the result of some massive cunning, breeding conspiracy.

SPEAKER_1 (4:11)

Oh wow.