ChainWhat it assumes · how to break it
Start
A regulator such as Ofgem caps the prices a network utility can charge, using an RPI − X formula.
1
As a result, the firm cannot charge its profit-maximising price where MC = MR and must keep its prices at or below the cap.
price cap · RPI − X
price cap · RPI − X
Assumes: The cap is set below the price the firm would otherwise charge.
But: If the cap is generous, it may barely bind and prices change little.
2
This means price is pushed down from the profit-maximising level towards MC, so output rises and the deadweight loss shrinks.
allocative efficiency · deadweight loss
allocative efficiency · deadweight loss
Best link to attack
Assumes: The cap can be set close to MC.
Assumes: The cap can be set close to MC.
But: In a natural monopoly MC lies below AC, so a cap at MC would cause losses; regulators usually set price nearer AC.
3
In addition, because the firm keeps cost savings beyond X until the next review, it has an incentive to cut waste, reducing X-inefficiency.
X-inefficiency · productive efficiency
X-inefficiency · productive efficiency
Assumes: The firm responds by cutting waste.
But: It may instead cut investment and maintenance, which lowers quality and dynamic efficiency over time.
End
Allocative efficiency improves as price moves towards MC, and X-inefficiency falls as the firm cuts costs.
Evaluation chain
- E1However, the gain in allocative efficiency depends on where the regulator can set the cap.
- E2Because a natural monopoly has falling AC, its MC lies below AC, so a price equal to MC would leave it making a loss.
- E3As a result, the regulator must set price nearer AC to keep the firm in business, or subsidise it, so some deadweight loss remains.
- E4So price caps improve allocative efficiency, but in natural monopolies they cannot reach full allocative efficiency without a subsidy.
Another way to attack it: A tight cap may squeeze the profit available for investment, reducing dynamic efficiency in industries that need large, long-term investment such as water and energy networks.
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Questions this answers
- Assess the impact of price regulation on efficiency in a natural monopoly.
- Explain how a price cap can reduce X-inefficiency.
- Discuss whether regulators can make utilities as efficient as competitive firms.
Diagram
Natural monopoly diagram with falling AC and MC below it: show the unregulated price (MC = MR), the cap at AC (normal profit) and the allocatively efficient price at MC, where the firm would make a loss.
Reverse and related
Removal of a price cap → price rises back above MC, the deadweight loss grows and the pressure to cut costs weakens.