I suspect any example I give will be rejected because it is "no longer a monopoly" or doesn't conform to your standard of what a monopoly is. I will say in advance that most, if not all monopolies these days do not exist as true "monopolies" anymore because of government intervention.
Two examples comes to mind. Dyson have had a monopoly on dual cyclone vacuum cleaners ever since they invented and patented the technology. They sell them for affordable prices, and their vacuum cleaners are more effective at picking up dust than bagged ones.
The other example of a good monopoly is almost kind of abstract. The Patenting System gives exclusive rights for the inventor of a technology to sell their invention for 20 years. The reason this is a good idea is that it encourages new development of technology. What is the point of a person spending hours of time, thousands of dollars, etc on developing a new technology if anyone can go and copy it and make a profit on it.
Two examples comes to mind. Dyson have had a monopoly on dual cyclone vacuum cleaners ever since they invented and patented the technology. They sell them for affordable prices, and their vacuum cleaners are more effective at picking up dust than bagged ones.
The other example of a good monopoly is almost kind of abstract. The Patenting System gives exclusive rights for the inventor of a technology to sell their invention for 20 years. The reason this is a good idea is that it encourages new development of technology. What is the point of a person spending hours of time, thousands of dollars, etc on developing a new technology if anyone can go and copy it and make a profit on it.
