The Indian paints industry, as it stands today, is a textbook Bresnahan case post-entry of Birla & JSW:
If λ =market power, the industry is moving towards a lower λ (higher competition, low coordination, price war) from a stable λ (moderate market power, disciplined competition)
Thinking about possible Nobel winners last week reminded me of one of my favorite empirical IO papers ever.
Oligopoly is more complicated than perfect competition. Different models reflect different solution concepts. Bresnahan showed that you can identify the solution concept empirically. A beautiful early connection of IO theory and empirics.