Can you help me find an article that describes a firm operating as a monopolist or near monopolist (in a market with one dominant firm and several fringe firms, the dominant firm can essentially act as a monopolist)

1. Briefly describe the market and how the monopoly came to be.
2. Is the monopoly firm profitable, and what is preventing other firms from entering (or, in the case of a dominant firm, what is preventing the fringe firms from gaining a larger share of the market)?
3. Is this helpful or harmful to consumers, and should anything be done (or has something already been done) about this monopoly?
4. What decisions can the monopoly firm make that it couldn't in a more competitive market?
5. How do the additional options that this firm can take help increase its profitability?
6. Are there other markets that the monopolist firm has entered or could enter that are possible because of its monopoly in the initial market?