If a company is entering a market that is already a monopoly, their entry would not affect the market structure itself. The market would still be considered a monopoly, as there is only one dominant firm controlling the entire market. However, the entry of a new company could potentially disrupt the existing monopoly's control and lead to increased competition. This could result in lower prices, better products, and more choices for consumers. Ultimately, the impact of the new entrant on the monopoly market would depend on various factors such as the size and resources of the new company, the market conditions, and the competitive strategies employed by both firms.
