Could some one help me please to understand?

1. List and describe the four types of Market Structures.
2. In which type would Pegasus Air be competing and why? Provide support for your answer.

John and Paul recently formed a partnership for the purpose of creating a new, discount airline. They currently require some financial support to get the business started and are exploring potential sources. Before they undertake their first flight, they want to ensure that their liability will be limited so they may need to change the form of their business organization. The new discount airline. Pegasus Air, has unveiled a plan to fly from Toronto to the Bahamas for $99 one way