Do any of you know if it's possible for 2 or more market structures to be prevalent in an industry e.g. take away pizza. Say the concentration looks something like this:
Pizza hut - 25%
Dominos - 20%
Papa John's - 20%
Pizza hut would be considered a legal monopoly and may have price setting power, but all 3 firms are likely to act as non collusive oligopolies. Furthermore, if the remaining 35% were small firms they may see their section of the market as having monopolistic competition.
So would this industry be considered a legal monopoly, an oligopoly, or a combination of monopoly, oligopoly and monopolistic competition?