Natural monopoly and financing efficient provision
| English | Português |
|---|---|
| natural monopoly/ˈnætʃərəl məˈnɒpəli/ | monopólio natural |
| average-cost pricing/ˈævrɪdʒ kɒst ˈpraɪsɪŋ/ | preço baseado no custo médio |
A decision you can investigate
- Duplicating a network can duplicate its fixed costs without improving service. Keeping one network can also give its owner substantial power.
- Low-cost provision and a fair, sustainable price are separate policy questions.
Build the explanation
- Natural monopoly 自然垄断 occurs when one provider can supply the relevant market at lower total cost than multiple providers, often because large fixed costs and scale economies persist across market demand. The condition is technological and demand-dependent, not simply state ownership or any sole supplier. Test the relevant cost comparison and feasible capacities.
- Marginal-cost pricing can expand access and allocation but fail to cover fixed costs, requiring an explicit financing arrangement. Average-cost pricing 平均成本定价 can cover economic costs and normal returns but leave price above MC and output below the simple allocative benchmark. Public ownership, regulated private provision or competition for a service contract can address different concerns; each still needs cost information, investment, quality standards and accountability. Avoid pretending that duplicated networks are always the best way to create rivalry.
Work through the evidence
- A fictional network has TC=1000+2Q. Serving400 units with one network costs1800; two identical networks each serving200 cost1400 each, total2800. The extra1000 is duplicated setup cost, assuming the same quality, technology and capacity. Average cost at100/200/400 is12/7/4.5.
- With demand P=14−0.02Q, MR=14−0.04Q and MC2, monopoly output300 gives price8, TR2400, TC1600 and profit800. Marginal-cost price2 implies Q600: receipts1200 versus cost2200, a funding shortfall1000. For zero economic profit, set P=AC:14−0.02Q=1000/Q+2. The break-even roots are Q100/P12 and Q500/P4. The higher-output feasible comparison Q500 covers cost2000 with receipts2000, but P4 still exceeds MC2. A regulator must justify the chosen output and finance, not treat every AR/AC crossing as the best policy.
What is the extra cost from the two-network arrangement at total output400?
2800−1800=1000.
What is the funding gap at price2/output600?
TC2200 less receipts1200 gives1000.
A natural monopoly necessarily has efficient management.
A cost advantage from one network can coexist with waste, weak incentives or poor quality.
Test the limits
- The example excludes congestion, quality differences, capacity limits and alternative network technology. A technological change can undermine a natural-monopoly condition; distribution access and service activities may have different competitive possibilities. A cheap single network does not imply every associated activity must be monopolized.
- Subsidies need revenue and can weaken incentives; average-cost rules can reward inflated costs if monitoring is weak. Contract competition needs credible bidders and enforcement; public ownership needs governance and investment discipline. Evaluate service continuity, access, quality, consumer price, normal financing and regulatory information costs together. Natural monopoly is a cost proposition, not proof of efficient management or a universal choice of ownership.
At the high-output break-even root, what is price?
Q500 gives demand price14−0.02×500=4 and AC4.
Apply and explain your answer
- Why can price2 be allocatively attractive but financially incomplete in the model?
- It equals MC and supports output600, but only covers variable costs1200; fixed cost1000 still needs financing.
Match the terms to their meanings.
Use each term for its stated economic relationship.
Use the terms precisely
- natural monopoly: A technology/demand situation where one provider supplies the relevant market at lower total cost than multiple providers.
- average-cost pricing: Setting a price to cover average economic cost at a chosen output, with normal returns included.
A fictional network has TC=1000+2Q. Serving400 units with one network costs1800; two identical networks each serving200 cost1400 each, total2800. The extra1000 is duplicated setup cost, assuming the same quality, technology and capacity. Average cost at100/200/400 is12/7/4.5. With demand P=14−0.02Q, MR=14−0.04Q and MC2, monopoly output300 gives price8, TR2400, TC1600 and profit800. Marginal-cost price2 implies Q600: receipts1200 versus cost2200, a funding shortfall1000. For zero economic profit, set P=AC:14−0.02Q=1000/Q+2. The break-even roots are Q100/P12 and Q500/P4. The higher-output feasible comparison Q500 covers cost2000 with receipts2000, but P4 still exceeds MC2. A regulator must justify the chosen output and finance, not treat every AR/AC crossing as the best policy.
The example excludes congestion, quality differences, capacity limits and alternative network technology. A technological change can undermine a natural-monopoly condition; distribution access and service activities may have different competitive possibilities. A cheap single network does not imply every associated activity must be monopolized. Subsidies need revenue and can weaken incentives; average-cost rules can reward inflated costs if monitoring is weak. Contract competition needs credible bidders and enforcement; public ownership needs governance and investment discipline. Evaluate service continuity, access, quality, consumer price, normal financing and regulatory information costs together. Natural monopoly is a cost proposition, not proof of efficient management or a universal choice of ownership.
Natural monopoly occurs when one provider can supply the relevant market at lower total cost than multiple providers, often because large fixed costs and scale economies persist across market demand. The condition is technological and demand-dependent, not simply state ownership or any sole supplier. Test the relevant cost comparison and feasible capacities.