Are monopolies good or bad for society?

Tasks:

Find 2 present day firm/industry in which one firm has most of the control of a market. (For example: Duke Energy). Briefly describe the firm and industry and why you believe it is, or close to, a monopoly. Make sure you use the characteristics of a monopoly to define it, such as barriers to entry, control over price, etc... For one of the firms, make an argument for why their monopoly status is good for society. For the other firm, make an argument for why their monopoly status is bad for society.