In one of the most famous episodes of the original Star Trek series, The Trouble with Tribbles written by David Gerrold, much of the crew is convinced to buy these adorable little cooing furballs known as tribbles. A crafty salesman manages to unload quite a few of these before the crew realizes that they reproduce faster than Mormon bunnies overdosing on Viagra. Would he have managed to sell so many had the customers known they could make many more of their own by just over-feeding them a bit?
The trouble with selling tribbles is they just aren’t a scarce commodity. It’s built into their nature. The shifty Star Trek character wasn’t just selling tribbles. Every tribble he sold was also a tribble factory!