Respond to the following prompt in a post with a minimum of 150 words. Then comment on at least TWO other posts.

We've observed that there are few examples of perfectly competitive markets in the real world, yet we use the model of perfect competition as a comparison with other market structures. Can you think of any examples of monopoly in the real world?Describe something you believe could possibly called a monopoly and explain why it fits the characteristics of a monopoly. Is your example a true, unregulated monopoly? (For example, Microsoft has been called a monopoly, but it is not the sole producer of computer operating systems, so strictly speaking it's not a monopoly.)