Can a oligopoly earn long run economic profits?

Yes, an oligopoly can earn long-run economic profits due to the market power held by a few dominant firms. These firms typically engage in strategic pricing and may collaborate (explicitly or implicitly) to restrict output and maintain higher prices. Barriers to entry, such as high startup costs and brand loyalty, further protect these firms from new competitors, allowing them to sustain profits over time. However, the level of competition within the oligopoly can influence the extent of these long-term profits.