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September 24, 2025 10 mins

In this episode, we first travel more than 100 years to the city of Delhi, in India. 

The British colonial government decided to eliminate the overpopulation of cobras slithering around and put a bounty on each of them. The economic incentive initially worked well. However, the authorities did not foresee other subsequent events... Based on this story, in 2002, the German economist Horst Siebert coined the term “cobra effect” to describe cases of unintended consequences when the proposed solution backfires, making the problem worse. Hence, the title of this podcast! 

Today, we will also discuss two other cases of "cobra effects" in Vietnam and Brazil related to rats. 

These examples illustrate how unintended consequences transform good intentions into bad policies. From ancient Mesopotamia to current world events, The Cobra Effect Podcast explores the unintended consequences of government policies, including taxation, price and wage controls, foreign aid, collectivization, environmental issues, and more. Four millennia of history on all continents demonstrate that we repeat the mistakes of the past when judging ideas by intentions rather than results.

Sources:

1- Cobras 

https://www.amazon.com/Kobra-Effekt-Irrwege-Wirtschaftspolitik-vermeidet/dp/3421056781 

https://fee.org/articles/the-cobra-effect-lessons-in-unintended-consequences/ 

https://freakonomics.com/podcast/the-cobra-effect-2/ 

2- Rats in Vietnam

https://www.hanoivietnam.fr/le-massacre-des-rats-de-hanoi-en-1902/ 

https://madeinchinajournal.com/2020/08/20/the-great-hanoi-rat-hunt/ 

https://www.jstor.org/stable/41299413?typeAccessWorkflow=login

https://www.jstor.org/stable/41938159?typeAccessWorkflow=login 

3- Rats in Brazil

https://revistapesquisa.fapesp.br/en/war-on-the-plague/ 

https://agenciabrasil.ebc.com.br/en/https%3A//agenciabrasil.ebc.com.br/en/node/1474734 

https://oswaldocruz.fiocruz.br/index.php/en/biography/scientific-career/general-directorate-of-public-health/the-campaign-against-the-bubonic-plague 

Bastiat’s essay: https://oll.libertyfund.org/page/wswns 

Support the show

Thank you for listening. For additional information and social media links, you can visit https://www.thecobraeffectpodcast.com

You can support the show on Buy Me a Coffee or become a monthly member. Links on the website. You help me to cover my costs, and your contribution keeps this project going.

Feel free to reach out via social media or email. The email address is contact@thecobraeffectpodcast.com

I would appreciate hearing your questions, comments, or suggestions for future topics. See you in two weeks for another episode of The Cobra Effect Podcast.

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