The markets that can be considered oligopolies from your list are:
- American Automobiles - This market is dominated by a few major players (e.g., Ford, General Motors, and Chrysler).
- National Football League (NFL) - The NFL operates in a market with a limited number of teams (franchises) that have significant market power.
- Cell Phone Service - This market is characterized by a few dominant companies (e.g., Verizon, AT&T, T-Mobile) that control a large portion of the market.
- Breakfast Cereal - A few companies (like Kellogg's, General Mills, and Post) dominate this market.
The other options:
- Hair Salons are typically numerous and diverse, which makes this market more competitive than oligopolistic.
- Local Electric Company - In many areas, there may be only one provider, which leans more towards a monopoly rather than an oligopoly.
So, the final oligopolies from the list are:
- American Automobiles
- National Football League (NFL)
- Cell Phone Service
- Breakfast Cereal