It’s the 18th century in British ruled India. In Delhi, the Brits have a problem. It seems that there are far too many Cobras in the streets of Delhi and these Cobras are presenting a health crisis.
So, the Brits, always so wise in their administration of their colonies, arrive at an idea. They decide to offer a bounty for every dead Cobra that is turned into their designated Cobra centers.
This works great … for awhile. Dead Cobras are being turned in. People are making some money from the exchange. Delhi is becoming comparatively pestilent free of Cobras. However, during the period in which there was a bounty on cobras, the number of rats in Delhi increased and with it an outbreak in the bubonic plague. When the bounty ended, the number of rats significantly decreased.
Also, someone gets the idea of breeding Cobras as a lucrative option. The reasoning went like this …. “We will breed Cobras which have monetary value, and then once they reach a certain maturity we will kill the Cobras and turn them in for the English bounty.” The English bounty was working as a subsidy on Cobras and whatever a government subsidizes it gets more of.
The moral of the story …. Beware the law of unintended consequences.