The sources of oligopoly are generally the same as for monopoly, that is, barriers to entry.

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Both oligopoly and monopoly markets are characterized by the presence of barriers to entry, which can include high startup costs, control over essential resources, regulatory hurdles, and strong brand identity, among others. These barriers prevent new competitors from easily entering the market, thus maintaining the market power of the existing few (in the case of oligopoly) or single (in the case of monopoly) firms.

The Sources of Oligopoly Are Generally the Same as for Monopoly