Understanding the Kinked Revenue Curve and Market Structures

The question asks about the specific market structure that is typically associated with a kinked-shaped revenue curve. This type of curve, often discussed as the kinked demand curve, is a model used to explain price rigidity in certain markets.

What is the Kinked Demand/Revenue Curve?

The kinked demand curve theory suggests that competing firms in an oligopoly market face a demand curve that is not smooth but has a 'kink' at the current market price. This kink arises from the assumed reactions of rival firms to price changes:

• If a firm raises its price above the current market price, its rivals are assumed not to follow the price increase. As a result, the firm will lose a significant number of customers to its competitors, making the demand curve relatively elastic above the kink.
• If a firm lowers its price below the current market price, its rivals are assumed to follow the price decrease to avoid losing their market share. This means that the firm will gain only a small increase in sales, as other firms also lower prices, making the demand curve relatively inelastic below the kink.

Because revenue is directly related to the demand curve (Total Revenue = Price x Quantity Demanded), the shape of the demand curve directly influences the shape of the revenue curves (Total Revenue, Average Revenue, and Marginal Revenue). The kink in the demand curve leads to a discontinuity in the marginal revenue curve.

Analyzing Market Structures and Their Revenue Curves

Let's consider the typical revenue curves for the market structures listed in the options:

Perfect Competition

In perfect competition, firms are price takers. The demand curve for an individual firm is perfectly elastic (horizontal) at the market price. The Average Revenue (AR) and Marginal Revenue (MR) curves are identical to the demand curve and are also horizontal lines.

Oligopoly

Oligopoly is a market structure characterized by a small number of large firms that are interdependent. The actions of one firm significantly impact the others. The kinked demand curve model is specifically designed to describe the behavior of firms in some types of oligopoly, leading to the characteristic kinked demand and, consequently, kinked revenue curves.

Monopoly

A monopoly is a market structure where a single firm controls the entire market. The monopolist faces the market demand curve, which is typically downward-sloping. The Average Revenue (AR) curve is the same as the demand curve, and the Marginal Revenue (MR) curve is below the AR curve and has twice the slope.

Monopolistic Competition

Monopolistic competition is a market structure with many firms selling differentiated products. Each firm faces a downward-sloping demand curve, but it is generally more elastic than that of a monopolist due to the availability of close substitutes. The AR curve is the demand curve, and the MR curve is below it, similar to a monopoly, but generally flatter due to higher elasticity.

Why the Kinked Curve Belongs to Oligopoly

The core assumption behind the kinked demand/revenue curve is the interdependent decision-making among a few dominant firms. This interdependence is the defining characteristic of oligopoly. The model explains why prices in an oligopoly might be stable, or "rigid," even when costs change, because firms are hesitant to change prices due to the asymmetric reactions of their rivals.

Therefore, the kinked-shaped revenue curve (derived from the kinked demand curve) is a concept directly related to the specific behavior and interdependence found in an oligopoly market structure.

Revision Table: Market Structure Concepts

Additional Information: Kinked Demand Curve Assumptions

The kinked demand curve model, developed by Paul Sweezy, rests on specific assumptions about rival behavior in an oligopoly:

• Rivals will match price cuts but not price increases.
• This asymmetric response leads to the kink at the current price level.
• The discontinuity in the marginal revenue curve implies that marginal costs can fluctuate within a certain range without changing the profit-maximizing price and output, thus explaining price rigidity.

While a useful tool for understanding price rigidity in some oligopolies, the model has limitations, such as not explaining how the initial price level is determined.