Answer: Oligopolies exist and do not attract new rivals because: " A. of barriers to entry.".
Explanation: One of the main characteristics of the oliopolio is the existence of barriers to entry, so there is the fact that there are few companies in a market. In general, one of the most relevant is usually the economies of scale that make the entry of A company is only viable when it can reach a significant proportion of the market. Although we could also add legal or reputational barriers (brands that have been in the market for a long time).
