Monopolistic Competition and Market Power Study Notes

Topic 2: Monopolistic Competition - Aims and Learning Objectives

• This section focuses on several key concepts regarding market structures that fall between perfect competition and monopoly.
• Market Power: Understanding the ability of a firm to influence prices.
• Assumptions: The foundational characteristics that define a monopolistically competitive market.
• Short Run Dynamics: How firms determine output and price, and the types of economic profit or loss they may encounter.
• Long Run Dynamics: The impact of free entry and exit on market equilibrium and profit levels.
• Competition and Efficiency: Analyzing whether this market structure achieves allocative and productive efficiency compared to other models.

Assigned and Recommended Readings

• Primary Source: See the Connect platform for specific assigned reading materials.
• Supplemental Books:
  • Mankiw & Taylor, Chapter 15.
  • Pindyck & Rubinfeld, Chapter 12, pp. 435-441.
  • Besanko & Braeutigam, Chapter 13, pp. 523-528.

Understanding Market Power

• Definition: Market power is defined as the ability of a firm to increase the price of its product without losing all of its customers.
• Relationship with Demand Elasticity:
  • The more inelastic the Demand curve, the more market power a firm possesses.
  • Conversely, the more elastic the Demand curve, the less market power a firm possesses.
• Market Structure Context: Most goods and services in real-world economies are exchanged under conditions of imperfect competition rather than perfect competition.
• Sources of Market Power in Monopolistic Competition: Firms gain power through product differentiation. Sources of differentiation include:
  • Physical attributes: Colour, packaging, and tastes.
  • Quality: Durability or performance.
  • Service: Customer support and after-sales care.
  • Location: Convenience of access for the consumer.

Foundations and Assumptions of Monopolistic Competition

A monopolistically competitive market is defined by four core assumptions:

1. Large Number of Competitors:
   • There are many firms in the market, each with a small market share.
   • Firms act independently and ignore the actions of other individual firms.
   • Collusion (fixing prices or output levels) is impossible due to the sheer number of participants.
2. Free Entry and Exit:
   • There are no significant barriers to entering or leaving the industry.
   • This implies that firms cannot sustain economic (supernormal) profits in the long run.
3. Differentiated Products:
   • Each firm produces a product that is slightly different from its competitors.
   • These products are close substitutes but not perfect substitutes.
4. Competition on Non-Price Factors:
   • Firms compete through product quality, price, and marketing/advertising strategies.

Common Industry Examples:

• Audio and video equipment.
• Cosmetics.
• Frozen foods, canned foods, and soft drinks.
• Book printing.
• Clothing.
• Pharmaceuticals (e.g., Nurofen, Panadol, Pams varieties of ibuprofen and paracetamol).

The Role of Marketing and Advertising

Firms in monopolistic competition and oligopolies invest heavily in advertising to differentiate their products and build brand loyalty.

Total Advertising Expenditures in Ireland (IRL) in 2006 (Millions of Euros):

• Print media: $926\,\text{million}$
• Television: $287\,\text{million}$
• Radio: $106\,\text{million}$
• Other (cinema, internet, etc.): $81\,\text{million}$
• Total: $1,400\,\text{million}$

Total Advertising Expenditures in Ireland (IRL) in 2022 (Millions of Euros):

• Press advertising: $82.4\,\text{million}$
• Television: $263.0\,\text{million}$
• Radio: $152.7\,\text{million}$
• Online: $810.1\,\text{million}$
• Other: $73.8\,\text{million}$
• Total: $1,382.0\,\text{million}$

Types of Advertising:

• Informative Advertising: Provides data on price, quality, and availability.
  • Example: ALDI "Special Buys" brochures featuring specific items like mountain bikes for $349\,\text{euros}$, trampolines for $149\,\text{euros}$, or weekly "Super Savers" on fresh produce and meats.
• Branding as Part of the Product: Branding can make a product more enjoyable even without new information.
  • Example: Taste tests show consumers enjoy cola more if labeled "Coke."
• Marketing and Packaging: In the perfume industry, approximately $3\,\%$ of a bottle's cost is for ingredients, while the remainder is spent on marketing and packaging. Studies show scent preference is often tied to ego and branding rather than the scent itself; people often dislike their "favorite" scents in blind tests.

Arguments For and Against Product Differentiation and Advertising

The Case For Differentiation and Advertising:

• Satisfies a wide range of consumer tastes and preferences.
• Promotes high quality and efficient production.
• Provides consumers with essential information regarding availability, quality, and price.
• Facilitates efficient decisions within the market.

The Case Against Differentiation and Advertising:

• Wastes societal resources and causes inefficiency.
• Vast sums of money are spent solely to raise the cost of products.
• Can lead to unproductive "warfare" between brands.
• May act as a barrier to entry by requiring high marketing budgets.
• Reduces real competition by focusing on perceived rather than actual differences.

Conclusion: There is no definitive answer. Some studies suggest advertising leads to market concentration and higher profits, while others suggest it improves market functioning by informing consumers.

Monopolistic Competition in the Short Run (SR)

In the short run, a firm in monopolistic competition operates similarly to a monopoly.

• Output Decision: Once product quality and marketing are established, the firm produces at the profit-maximising quantity ($Q^*$) where Marginal Revenue equals Marginal Cost ($MR = MC$).
• Price Decision: The highest price ($P^*$) the firm can charge for $Q^*$ is determined by the Demand ($D$) curve.

Scenario 1: Economic Profit:

• Occurs when Price is greater than Average Total Cost ($P > ATC$).
• Total Revenue ($TR$) = $0P^*XQ^*$
• Total Cost ($TC$) = $0C^*YQ^*$
• $\text{Economic profit} = \text{rectangle } P^*XC^*Y$

Scenario 2: Economic Loss:

• Occurs when the ATC curve is above the Demand curve at the profit-maximising equilibrium ($P < ATC$).
• Total Revenue ($TR$) = $0P^*YQ^*$
• Total Cost ($TC$) = $0C^*XQ^*$
• $\text{Economic loss} = \text{rectangle } C^*XP*Y$
• If a loss is sustained, the firm will eventually exit the industry.

Monopolistic Competition in the Long Run (LR)

• Market Entry: If firms are earning economic profit in the short run, new firms have an incentive to enter the market.
• Impact of Entry: Entry causes existing firms to lose market share, shifting their individual Demand curves to the left.
• Zero Economic Profit Equilibrium:
  • Entry continues until Price equals Average Total Cost ($P = ATC$).
  • At the long-run equilibrium point, the Demand curve is tangent to the ATC curve.
  • Firms earn only a normal profit (zero supernormal profit).
  • Profit maximization still occurs at $MR = MC$, but at this quantity ($Q_{MC}$), $P = ATC$.

Efficiency in Monopolistic Competition

Allocative Efficiency:

• Requires Marginal Benefit ($MB$) to equal Marginal Cost ($MC$).
• Since Price ($P$) measures $MB$, efficiency requires $P = MC$.
• In Monopolistic Competition, even in the long run, firms produce where $P > MC$. This results in a "markup" over marginal cost.
• Because $P > MC$ (and therefore $MB > MC$), the market is considered allocatively inefficient.

Productive Efficiency and Excess Capacity:

• Efficient Scale: The quantity that minimizes Average Total Cost.
• Monopolistic Competition Result: Firms produce a quantity less than the efficient scale.
• Excess Capacity: The difference between the efficient scale and the quantity actually produced by the monopolistically competitive firm.

The Diversity Trade-off:

• While the price is higher and there is excess capacity, this inefficiency arises from product differentiation.
• Consumers value variety, though variety is costly to produce.
• It is argued that monopolistic competition may provide the socially profitable and efficient amount of variety to the market despite theoretical inefficiencies.

Summary of Main Points for Revision

1. Assumptions: Large number of firms, free entry/exit, differentiated products, non-price competition.
2. Short Run (SR): Firms can earn economic profits or incur economic losses based on the position of the ATC curve relative to Demand.
3. Long Run (LR): Freedom of entry and exit ensures firms earn zero economic profit (normal profit) where $P = ATC$.
4. Efficiency: The market structure is inefficient as $P > MC$.
5. Excess Capacity: Firms in this structure produce less than the output level required to minimize average total cost.