dear teacher, are the features of monopoly (market structure) as follows1. single seller2. no close substitute3. barriers to entry4. imperfect information (disclosed information to public) 5. price searcher6. non-price competition?so, what is the answer? thanks?

4. Which of the following about a monopoly is TRUE? A. Entry of new firms is extremely difficult. B. It does not face competition. C. No substitute is available. D. People always consume the same quantity, regardless changes in the price