Forrest easily enters the shrimp market by buying a boat. There are multiple buyers and sellers, and no one shrimping boat controls the price of shrimp. Therefore the shrimp market is an example of perfect competition. Once the hurricane hits it forces all the other boats to exit the market. Turning the market into a monopoly. Forrest is the sole supplier of the product, controlling the entire market, turning it into a monopoly.
Thanks for the clip and summary Keagan Rallis