Write a 3 to 4 page APA-formatted paper in which you address the questions below. Use at least three cited references that are peer-reviewed sources. Please utilize LIRN to help you get started with your search. You may visit the Academic Resource Center for a guide on how to utilize LIRN successfully.
1. Choose four real-world companies, respectively one for each market structure type - Perfect Competition, Monopoly, Oligopoly, and Monopolistic Competition.
2. Explain why the companies fit in the respective categories.
3. Compare and contrast the four companies with regards to their market structure characteristics, including, but not limited to: barriers to entry, number of firms in the market, short-term and long-term profits, price elasticity of demand, etc.