Type:
Solution Manual
Resource:
Environmental and Natural Resource Economics
Edition:
11th Edition
Author(s):
Tom Tietenberg Lynne Lewis
Instructor’s Manual for Environmental and Natural Resource Economics, 12th edition Originally prepared by Professor Lynne Lewis, Bates College, Maine, USA Revised and updated by Dr Leonie Stone, SUNY Geneseo, New York, USA
Chapter 2 The Economic Approach: Property Rights, Externalities, and Environmental Problems Chapter 2 reviews many of the basic economic concepts that will be used in later chapters. The chapter begins with a discussion of the interactions between the environment and the economy, followed by an explanation of the difference between positive and normative economics. Static efficiency is defined, and consumer surplus and producer surplus are reviewed. The characteristics of an efficient property rights structure are defined and deemed to be necessary for markets to efficiently allocate resources. The remainder of the chapter discusses four cases of market failure: externalities, common property resources, public goods and imperfect market structures. The chapter ends with a discussion of possible remedies to a market failure, including legal remedies, and government regulation. This chapter briefly reviews a lot of material that will seem abstract and difficult to the students with a more limited economics background. You can expect to spend some number of days reviewing the material in this chapter, especially if you are teaching non-majors or those with only one semester of college level microeconomics.
◼ Teaching Objectives 1. Discuss the relationship between the environment and the economic system. 2. Explain the difference between normative and positive economics. 3. Define static efficiency. 4. Review consumer and producer surplus conceptually and graphically. 5. Define an efficient property rights structure, and explain how this property rights structure leads to economic efficiency. 6. Discuss the relationship between profit and producer surplus, and define scarcity rent. 7. Explain the concept of an externality, and show how externalities lead to market failure and an inefficient allocation of resources. 8. Define common property resources, and explain why common property resources tend to be overused. 9. Define public goods, and explain why the private market does not produce the efficient quantity of a public good.
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10. Discuss monopoly, asymmetric information, and the government’s behavior as sources of market failure. 11. Discuss possible remedies to market failure including legal remedies, and government regulation.
◼
Outline
I. The Human–Environment Relationship A. The Economic Approach 1. Positive economics attempts to describe what is. 2. Normative economics deals with what ought to be. 3. Some timely examples of where normative decision-making will be prevalent include dam removal and policies to prevent or mitigate climate change. II. Environmental Problems and Economic Efficiency A. Static Efficiency Resource allocations satisfy the static efficiency criterion if economic surplus is maximized. Economic surplus is the sum of consumer surplus and producer surplus. 1. Consumer surplus is the difference between total willingness to pay for the good and the actual cost of the good. 2. Total willingness to pay is a measure of the total value received from a good. 3. Producer surplus is the difference between the price of the good and the marginal cost of producing the good. 4. The supply curve is the marginal cost curve. Make sure students understand this fact. III. Property Rights This section focuses on the idea that economic efficiency depends on well-defined property rights. A. A property right is an entitlement held by either an individual or a state. B. A well-defined or efficient property right will be: 1. Exclusive: All benefits and costs accrue only to the owner. 2. Transferable: Property rights can be exchanged voluntarily. 3. Enforceable: Property rights cannot be seized by others. Owning a resource with these characteristics ensures that the resource will retain both its use value and its asset value. Resources for which the asset value cannot be captured will typically be overexploited (e.g., common pool resources). This concept will be covered later in the chapter, but it might be a good time to remind your students of the concept of opportunity cost and introduce them to the idea of intertemporal opportunity cost. C. In a system with well-defined property rights, static efficiency is achieved. Self-interested parties make choices that are efficient from society’s point of view. D. In the short run, producer surplus is equal to profit plus fixed cost. The area under the marginal cost curve is total variable cost. In the long run, producer surplus is equal to profit plus rent. Rent is the return to scarce inputs owned by the producer. Under perfect competition, long-run profit equals zero and producer surplus equals rent. [Remind your students that economic profit is not the same as accounting profit.] E. Scarcity rents are the returns that persist in the long-run competitive equilibrium. IV. Externalities as a Source of Market Failure Information Classification: General
Chapter 2
The Economic Approach: Property Rights, Externalities, and Environmental Problems
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Market failure can be the result of a property right system that fails to achieve exclusivity, transferability, or enforceability. If an agent making a decision does not bear all of the consequences (costs and benefits) of that decision, then the characteristic of exclusivity is violated. This results in what is called an externality. A. Externalities or third party effects exist whenever one agent’s activities affect another agent’s welfare. B. An external diseconomy or negative externality imposes costs on a third party. An example of a negative externality is a steel mill upstream from a fish hatchery. If the steel producer does not take into account the costs from waste discharges that might harm the hatchery, these costs are passed on to the fish hatchery and any other “third” or downstream parties. [The textbook example is one of a steel mill upstream from a resort hotel. Both are users of the river.] C. Marginal social costs (all costs to society) will not be equal to marginal private costs (producer’s costs). Take some time to discuss the difference between MCS and MCP, which can be thought of as marginal external cost (MCE). D. The private market equilibrium will be at a point where too much steel is being produced. The price of steel will be too low. Too much pollution is being produced. This is illustrated in text Figure 2.5. It is simplest to assume that marginal private benefits are equal to marginal social benefits, both of which are given by the demand curve. The private market reaches equilibrium, but does not take into account the third party effect (or damages in this case) imposed on the downstream party. At the private market equilibrium, marginal social costs are higher than marginal benefits, resulting in a deadweight loss. The market failure results from a negative externality. E. Some potential solutions, such as a tax that raises private costs and reduces output could be briefly introduced here and returned to in later chapters. Many different examples will be useful to help illustrate this concept. Use examples from the text or from the news. F.
An external economy or positive externality occurs whenever an activity imposes benefits on a third party. Classic examples of positive externalities include the external benefits from vaccines or education. Individuals who plant flowers in their yards will maximize their own net benefit from the flowers when deciding how much to plant. It is unlikely that the third party benefits that accrue to passersby will be included. Likewise, the decision to get a flu shot is likely driven by the benefits received from not getting the flu—not from the benefits of associated individuals who will also have less chance of getting the flu if you get immunized. In this case, marginal private benefits will be lower than marginal social benefits. Too little will be produced by the private market and prices will be too high. Again, this case can be illustrated graphically with the simplifying assumption that marginal social costs equal marginal private costs to emphasize the difference in marginal benefits.
A positive externality also provides an argument for government intervention. An example would be a subsidy to the producers, which increases output and lowers price. V. Alternative Property Rights Structures and the Incentives They Create There are four general property rights regimes that create different incentives for resource use (or misuse). A. Under private property regimes, individuals hold entitlements. B. Under state-property regimes, governments own and control property (e.g., some parks and forests).
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• Environmental and Natural Resource Economics, Twelfth Edition
C. Common-property regimes are those in which property is jointly owned and managed by a specific group. Common property regimes are quite variable, but many result in overexploitation of the resource. Over-fishing in local fisheries or over-hunting can be good examples. A few successful examples exist such as the system of allocating grazing rights in Switzerland. D. Under res nullis or open access regimes, no one owns or exercises control over the resources. This type of regime leads to the “tragedy of the commons” because the resources can be exploited by whoever can get to them first. E. Common pool resources are characterized by non-exclusivity and divisibility. These characteristics allow the resource to be exploited by anyone. Access cannot be denied, and the amount captured will be eliminated from the original amount available (divisibility). Unrestricted hunting access of the American bison, unregulated groundwater withdrawal, and high seas fisheries are all examples of resources that share the characteristics of common pool resources and the tragedy of the commons. The mentality associated with these open access resources is “get it while the getting is good” and “if I don’t get it, someone else will.” The asset value of the resource is essentially zero since non-exclusivity implies that it cannot be saved for later. [Ask your students what this implies about the effective discount rate.] VI. Public Goods A. Public goods are both indivisible and nonexcludable. B. Indivisibility means that one person’s consumption does not affect another’s. C. Nonexcludability means that persons cannot be kept from enjoying the benefits of a good even if they do not pay for it. D. Clean air, national defense, and biological diversity are all examples of public goods. E. Biological diversity includes the amount of genetic variation among individuals within in a single species and the number of species in a community. Species have value beyond intrinsic value by providing ecological stability, and potentially providing sources of food, raw materials and medicines. The private market will not produce the efficient amount of biological diversity. F.
Public goods will be underprovided in a private market because of free-riders. A free-rider is someone who derives benefits from a commodity without contributing to its supply. Someone who does not pay taxes, for example, cannot be excluded from the provision of national defense. Likewise, someone who does not contribute to the nature conservancy will not be excluded from the biodiversity benefits from land preservation.
G. An efficient allocation is determined by the intersection of the demand curve and the marginal cost curve. In the presence of free riders, the private market demand curve will not reflect all of the benefits of the resource resulting in under-provision of the resource. Additionally, efficient pricing requires that a different price be charged to each consumer. Since the excludability criterion is violated, consumers may not reveal their true willingness to pay. The market demand curve is derived in text Figure 2.7 from two individual demand curves. VII. Imperfect Market Structures A. Markets that are not competitive will exhibit inefficiencies. Monopolies will supply too little of a good at too high a price. A cartel is a group of producers who form a collusive agreement to gain monopoly power. OPEC, for example, colludes in order to gain monopoly power. Restricting output raises the price of oil. B. At the monopoly output, marginal benefits are greater than marginal costs. Net benefits are not maximized and there is a deadweight loss. VIII. Asymmetric Information
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