Oligopoly is a market controlled by a few companies, and each player's decisions are likely to affect the others. Mohnish Pabrai, a famous investment guru, once talked with Charlie Munger about oligopoly, concluding that oligopoly is a good way for companies to keep decent profit margins and stay competitive together.
Case 1:
Take the HDD (hard disk drive) industry as an example. In the past 25 years, it was a terrible business with over-competition and...