Markets generally lead to efficient allocations under certain conditions.
If assumptions regarding market conditions are violated, it can lead to market failure.
Assumptions for Efficient Markets
Perfect competition (Agents act as price-takers)
Existence of complete markets
Agents possess perfect information
Absence of public goods
No externalities present
Consequences of Market Failures
Imperfect competition (competition failure)
Incomplete markets
Information failures
Presence of public goods
Externalities
Reference Materials
Detailed content can be found in chapter 11 "Theory of Natural Monopoly" from the book by Viscusi, Vernon, and Harrington (2005).
The chapter is available on the course's virtual campus.
Guiding Questions
What is the natural monopoly and why does it emerge?
How and why do markets fail?
What is the dilemma associated with natural monopolies?
What are the possible government interventions, and what limitations do they have?
Outline of the Lecture
What is the natural monopoly?
Pricing Strategies
Policy solutions
Regulatory reforms
Classical Examples of Natural Monopolies
Typical natural monopolies include public utility industries such as:
Tap water supply
Electricity generation and distribution
Gas supply
Telecommunications
Transportation services
Active Learning Question
Key Feature: What is a common feature shared by all these industries?
Infrastructure Components for Water Supply and Sanitation
Water Collection
Water Purification
Transportation and Storage of water
Smart Distribution Systems
Consumption by consumers
Sewerage Systems
Water Purification processes
Reuse or Return of water
Further Examples of Natural Monopolies
Additional unspecified examples exist (described with ∞ symbol).
Review of Cost Structures
Variability in fixed costs and marginal costs:
No fixed costs, (linear) increasing marginal cost (MC)
Fixed costs, (linear) increasing MC
No fixed costs, constant MC
Fixed costs, constant MC
Understanding Declining Average Costs
A firm with the following Average Cost (AC) curve exhibits declining AC everywhere, which has implications for Marginal Cost (MC).
Implications of Declining Average Costs
The Marginal Cost (MC) curve will always lie below the Average Cost (AC) curve.
Active Learning Question
What are the implications of declining AC for competition?
Definition and Explanation of Natural Monopoly
Natural Monopoly: An industry in which the production of a good or service by a single firm minimizes costs. Hence, this single firm supplies the entire market at a lower AC than any potential competitor.
The emergence of a natural monopoly is derived from specific cost structures and technology.
Underlying Cost Structures
Cost Structures Leading to Natural Monopolies:
High fixed costs (e.g., infrastructure like grids) leading to declining AC without needing economies of scale.
Economies of scale: Describes a situation where increasing returns to scale in the production process can be expressed as:
q = f(g imes x) > g imes f(x)
Total Cost (TC) for producing $g$ times the quantity $q$ can be expressed as: TC(g imes q) < g imes TC(q) (1)
Economies of scope: Refers to producing two goods together being cheaper than individually:
TC(q1, q2) < TC(q1, 0) + TC(0, q2) (2)
Subadditive cost function: Less expensive for one firm to produce a given output compared to multiple firms:
TC(q1 + q2) < TC(q1) + TC(q2) (3)
Active Learning Question
Consider a firm with the following AC curve, identify economies and diseconomies of scale?
Understanding Subadditive Cost Function
Single Firm Production: Introduction of another firm complicates the cost structure, but producing as a single firm may still achieve lower average costs, despite some diseconomies of scale.
Characteristics of Subadditive Cost Functions
In both single-product and multi-product industries, subadditive functions define cost efficiency:
Single-product firm has a total cost function subadditive with respect to output if:
An example can be identified as demand $D_D$ that might cease to exhibit natural monopoly characteristics due to changing demand or technology, resulting in a potentially temporary monopoly.
Some Examples of Temporary and Permanent Monopolies
Airports and airlines (e.g., Luton 1938, Stansted 1943, etc.)
Long-distance phone services and cable capacities, with historical transitions to competition from trucking.
Pricing Strategies
Active Learning on Pricing
Under perfect competition, firms set price equal to marginal cost (p = MgC). However, this may not apply in the discussed cost structures.
1. Marginal Cost Pricing
Setting $P = MgC$ may lead to losses:
Losses and Competition Failure
Firms with incentives to undercut prices to gain market share may end up reducing prices to $p = MgC$.
Eventually, only one firm may remain.
Market Efficiency
While $(Q0, P0)$ is the efficient allocation (welfare-maximizing), it does not represent competitive equilibrium.
2. Monopolistic Pricing
If only one firm persists, it sets monopolistic prices leading to equilibrium points $(Qm, Pm)$ that deviate from efficiency.
Dilemma of Natural Monopolies
At $P(Q) = MC$, the welfare-maximizing production implies losses under specific cost structures facing a single firm.
The monopoly pricing approach can cover fixed costs but intrinsically entails efficiency losses, creating challenges in generating socially optimal outcomes.
3. Average Cost Pricing
Average Cost pricing permits zero profit scenarios, where total revenue equals total cost:
Total Revenue: TR = P^ imes Q^ imes
Total Cost: TC = AC(Q^ imes) imes Q^ imes
Factors continue to include efficacy trade-offs.
4. Two-Part Tariff
Pricing model consisting of unit price $p$ plus a fixed charge $f$.
Example: Total costs can be given by:
TC(Q) = F + cQ
To achieve efficiency while sustaining costs, optimal strategies require $p=c$ and $f= rac{F}{N}$.
Alternative structures may encourage market participation by accounting for consumers’ willingness to pay, e.g., discriminatory tariffs.
Policy Solutions for Natural Monopolies
Approaches to Addressing Natural Monopolies:
Regulation:
Options include:
Doing nothing.
Providing a subsidy.
Implementing rate of return regulation (AC pricing).
Utilizing price-cap regulation.
Public Enterprise:
Government ownership and operation of monopolistic services, which mirrors challenges faced under AC pricing methodologies.
1. Regulation: "Doing Nothing"
This may be acceptable if close substitutes exist, reducing inefficiency even with monopolistic conditions.
2. Subsidizing the Private Firm
Loss compensation through government subsidy needs consideration of limitations, including services provided where total costs exceed willingness to pay.
3. Average Cost Pricing in Practice
Rate of return regulation seeks a balance, but can lead to adverse incentives under asymmetric information conditions.
4. Price-Cap Regulation
Sets a maximum price below monopoly pricing, incentivizing cost reductions but requiring adaptive strategies around expectations of price changes over time.
Regulatory Reforms
Historical Context
1980s and 1990s witnessed extensive privatization of public enterprises, notably in the UK and other advanced economies.
Ongoing Research
Publications addressing regulatory economics: costs, natural monopolies, competition policy, and various regulatory issues are continuously researched and published.
Regulatory Considerations
Structural arrangements, like vertical separation between production and distribution, can promote efficiencies but may lose some economies of scope.
Transparency in regulation helps to reduce instances of regulatory capture.