This assignment is to discuss wether market entry in real-world is as automatic as it is described as in textbook world.
Structure of this assignment should be as follow.
Introduction: Discuss barriers to entry and describe how barriers work. No need for many details here. I do not want just copy and paste information from the lecture notes.

1-2 paragraphs: provide evidence of real world examples for markets with very low barriers to entry

1-2 paragraphs: provide evidence of real world examples for markets with significant barriers to entry

Conclusion: Keeping this structure you have balanced arguments about barriers to entry. Give me your conclusions commenting on how economists of different schools of thought could answer this question.