Imperfect Markets: Monopolistic Competition and Oligopoly

Definition and Overview of Monopolistic Competition

• Formal Definition: Monopolistic competition is defined as a market structure characterized by a large number of small sellers who sell differentiated products. Although these products are distinct, they are considered close substitute products for one another. This market structure allows for relatively easy entry into and exit from the market.

• Fundamental Characteristics:     * Large Number of Small Sellers: There are many sellers operating within the market. Because each individual seller is small relative to the total market, no single firm possesses the power to influence the overall market price. Despite this, each firm follows an independent price-output policy.     * Differentiated Products: Products are not identical. Product differentiation occurs through several methods, including:         * Packaging.         * Design.         * Labeling.         * Advertising.         * Brand names.     * Some Influence Over Price: Market power increases as a firm successfully differentiates its product. The higher the level of market power achieved, the greater the firm's ability to influence the price, making the firm a "price maker."     * Free Entry and Exit: While entry and exit are generally free, it is noted as not being as easy as in perfect competition due to the existing barriers created by product differentiation.     * Role of Non-Price Competition: This is a significant factor in monopolistic competition. Firms utilize various methods to attract customers to buy a specific brand rather than competing solely on price.     * Selling Cost: Firms incur additional costs through various types of expenditure on advertisement to promote their specific products.

Demand Curve for Monopolistic Competition

• Shape and Slope: The demand curve for a firm in a monopolistically competitive market is downward sloping. This slope is a direct result of product differentiation.

• Key Variables:     * The vertical axis represents Price ($P$).     * The horizontal axis represents Quantity ($Q$).     * The Marginal Revenue curve ($MR$) lies below the Demand curve ($D$).     * The Demand curve is represented as: $AR = P = \text{Demand}$.

• Comparison with Perfect Competition: In contrast to monopolistic competition, the demand curve for a firm in perfect competition is horizontal (perfectly elastic) because the firm is a price taker and must adhere to a consistent price level.

Comparison: Perfect Competition vs. Monopolistic Competition

• Number of Sellers:     * Perfect Competition: Very large number of small sellers.     * Monopolistic Competition: Large number of sellers, but fewer than in a perfect competitive market.

• Type of Product:     * Perfect Competition: Identical products.     * Monopolistic Competition: Differentiated products.

• Control of Price:     * Perfect Competition: Price taker; has no control over price.     * Monopolistic Competition: Price maker; possesses some power to influence price.

• Conditions of Entry:     * Perfect Competition: Very easy to enter and exit.     * Monopolistic Competition: Easy entry and exit, though less easy than perfect competition.

• Non-Price Competition:     * Perfect Competition: Not significant.     * Monopolistic Competition: Very significant, with heavy emphasis on advertising, brand names, and trademarks.

• Examples:     * Perfect Competition: Vegetables.     * Monopolistic Competition: Clothing products, toiletries, etc.

Definition and Characteristics of Oligopoly

• Formal Definition: An oligopoly is a market structure in which there are only a few firms selling either standardized (homogeneous) or differentiated products. This structure restricts the entry into and exit from the market.

• Fundamental Characteristics:     * Number of Firms: The number of firms is small, but the size of these individual firms is large.     * Types of Product:         * Homogeneous products (e.g., Petrol).         * Differentiated products (e.g., Cars, telecommunication (telco) services).     * Mutual Interdependence: Firms in an oligopoly must always consider the potential reactions of their rivals when making decisions regarding price, sales targets, advertising budgets, and other business policies.     * Barriers to Entry: Market entry by new competitors is restricted through various barriers, including:         * Ownership of patents and copyrights.         * Exclusive financial requirements.         * Legal barriers.

Price Determination and the Kinked Demand Curve in Oligopoly

• Price Rigidity: Due to mutual interdependence, prices in an oligopoly market tend to be stable. This phenomenon is known as price rigidity.     * Definition: Price rigidity refers to a situation where the price of goods and services does not change immediately.     * Logic: A firm has no incentive to increase or decrease the price due to the expected reactions of its competitors.

• Theory of the Kinked Demand Curve: This model assumes that the reaction to a price decrease differs from the reaction to a price increase. It is based on two primary assumptions:     * First Assumption (Price Decrease): If an oligopolist reduces its price, its rivals will follow suit and cut their own prices to prevent losing their customers to the firm that initiated the price cut.     * Second Assumption (Price Increase): If an oligopolist increases its price, its rivals will not increase their prices. By keeping their prices the same, the rivals gain customers from the firm that increased its price.

• Graphical Representation (Kinked Demand):     * The oligopolist faces a "kinked" demand curve due to these asymmetrical assumptions.     * The equilibrium price is denoted as $P^*$ and the equilibrium quantity is denoted as $Q^*$ at the point of the kink.     * The price is measured in Ringgit Malaysia ($\text{RM}$).

Comprehensive Comparison: Perfect Competition, Monopolistic Competition, and Oligopoly

• Number of Sellers:     * Perfect Competition: Very large number of small sellers.     * Monopolistic Competition: Large number of sellers (less than perfect competition).     * Oligopoly: Few sellers, but the size of the firms is large.

• Type of Product:     * Perfect Competition: Identical.     * Monopolistic Competition: Differentiated.     * Oligopoly: Identical (Homogeneous) or differentiated.

• Control of Price:     * Perfect Competition: Price taker; no control over price.     * Monopolistic Competition: Price maker; some power to influence price.     * Oligopoly: Price maker, but control is limited due to mutual interdependence.

• Conditions of Entry:     * Perfect Competition: Very easy to enter and exit.     * Monopolistic Competition: Easy entry and exit (not as easy as perfect competition).     * Oligopoly: Difficult; significant obstacles and restrictions to entry exist.

• Non-Price Competition:     * Perfect Competition: Not significant.     * Monopolistic Competition: Very significant (advertising, brand names, trademarks).     * Oligopoly: Significant; involves some advertising, especially for differentiated products.

• Examples:     * Perfect Competition: Vegetables.     * Monopolistic Competition: Clothing products, toiletries, etc.     * Oligopoly: Telco services, airline services.