A private landowner maintains forest cover that protects downstream communities from landslides and flooding.

Why might this service be underprovided in a market system?

Question

A private landowner maintains forest cover that protects downstream communities from landslides and flooding.

Why might this service be underprovided in a market system?

BlackTom AI · Accepted Answer

This is a classic example of a positive externality: the landowner’s forest provides spillover benefits (reduced landslide and flood risk) that accrue to downstream communities rather than being fully internalized by the landowner.

1) Relevant concepts
- Externality: when a decision-maker’s actions impose costs or benefits on others that are not reflected in market prices.  
- Positive externality / external benefit: private action yields additional social benefits.  
- Marginal private benefit (MPB) vs. marginal social benefit (MSB): MSB = MPB + external benefit.  
- Market equilibrium for a private actor is where MPB = private marginal cost (PMC); social optimum is where MSB = social marginal cost (SMC).

2) Step-by-step reasoning
- The landowner chooses land use based on private returns (timber, agriculture, recreation value), comparing MPB to PMC. The protective value of the forest for downstream communities is not paid to the landowner, so it is not part of the MPB.  
- Because the forest generates an external benefit (reduced flood/landslide damages), MSB > MPB by the amount of that benefit. The socially optimal level of forest cover would equate MSB and SMC, but the landowner stops where MPB = PMC.  
- Therefore the privately chosen level of forest is lower than the socially optimal level: underprovision occurs.

3) No numerical calculations are required, but conceptually: MSB = MPB + ExternalBenefit → MSB > MPB → private provision < social optimum.

4) Why the correct answer is correct
- “The benefits primarily accrue to others” directly describes a positive externality: the downstream beneficiaries receive protection without compensating the landowner, so market incentives don’t induce the socially optimal amount of forest.

5) Why other options are incorrect
- “Flood protection has no economic value”: false — avoided damage and reduced risk clearly have economic value.  
- “Forest cover prevents timber harvesting”: this may be true in some contexts but is not a general reason for underprovision in markets; it describes an opportunity cost rather than explaining why society gets too little protection.  
- “The landowner captures all benefits”: contrary to the premise; if the landowner captured all benefits, private and social incentives would align and provision would not be too low.

Conclusion: The service is underprovided because the benefits primarily accrue to others (positive externality), which matches the provided correct answer.

A private landowner maintains forest cover that protects downstream communities from landslides and flooding. Why might this service be underprovided in a market system?单项选择题

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