Q.What is oligopoly? Explain what is meant by 'interdependence' among firms in an oligopoly.

The Core Idea: Strategic Interdependence

Before we break down the two features, you need to grasp the single most important concept in oligopoly: strategic interdependence. In perfect competition or monopoly, a firm can act without worrying about how rivals will react. In oligopoly, you cannot. Every price cut, every new feature, every ad campaign — your rivals will notice and will respond. This changes everything about how firms behave.

Now let's look at the two features you asked about.

(a) Non-Price Competition

What it means: Instead of lowering prices to steal customers, oligopoly firms compete on everything except price — advertising, product quality, packaging, customer service, warranties, loyalty programs, and innovation.

Why they do this: Imagine two airlines on the same route. If Airline A cuts fares by 10%, Airline B will match the cut within hours to avoid losing passengers. Result? Both earn lower profits, and neither gains market share. This is the kinked demand curve logic — rivals match price cuts but not price increases. So price competition is a race to the bottom.

How it works in practice:

• Advertising and branding: Think of Coke vs. Pepsi. Both spend billions on ads, celebrity endorsements, and catchy jingles. They're not trying to undercut each other's price — they're trying to make you prefer their brand emotionally.
• Product differentiation: Smartphone companies add better cameras, faster processors, or unique software features. These differences justify the price and create brand loyalty.
• After-sales service: Car companies offer free servicing, extended warranties, or roadside assistance. This makes their product more attractive without changing the showroom price.
• Loyalty programs: Airlines have frequent-flyer miles; coffee shops have buy-10-get-1-free cards. These lock customers in and make them think twice before switching.

Exam tip: When asked about non-price competition, always mention the kinked demand curve as the theoretical foundation. Show that the demand curve is more elastic above the current price (rivals won't follow a price rise) and less elastic below it (rivals will match a price cut). This creates a discontinuity in marginal revenue and a strong incentive to avoid price changes.

(b) Few Sellers

What it means: The market is dominated by a small number of large firms. "Few" doesn't mean a fixed number — it could be 2 (duopoly), 3–5, or even 10–12 in a large industry. The key is that each firm has a significant market share and its actions noticeably affect the market.

Why this matters: When there are few sellers, each firm is a price maker (not a price taker like in perfect competition), but unlike a monopolist, it must consider rivals' reactions. This creates a game-theoretic situation — every decision is a strategic move.

Key implications:

• Barriers to entry: New firms find it very hard to enter. Reasons include huge capital requirements (steel plants, airlines), economies of scale (existing firms have cost advantages), brand loyalty (you can't easily compete with Coca-Cola's brand), and control over raw materials or patents.
• Interdependence: If Maruti Suzuki cuts car prices, Tata Motors and Hyundai must respond. If they don't, they lose market share. If they do, everyone's profits fall. This mutual dependence is the defining feature. …