Consider industries that demonstrate monopoly, monopolistic competition, oligopoly, and perfect competition.What is the goal of creating a brand name for each of these market structures? What does the brand name do to the demand curve for the product? What is the role of advertising in each of the four market structures?

My examples for each market is:

Monopoly - Microsoft

Monopolistic Competition - Home Depot and Lowe's

Oligopoly - Pepsi-Cola

Perfect Competition - eBay

How should I approach this?