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Economics of Externalities: An Overview

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Handbook of Production Economics

Abstract

Externalities arise when the decisions of an agent have direct effects on the welfare of others. This chapter presents an overview on the economics of externalities. Relying on Pareto efficiency, the analysis is presented in a general equilibrium framework and evaluates the efficient management of externalities. The investigation also focuses on the role of non-convexity and transaction costs. It covers alternative institutional setups, including markets, government interventions, and contracts. It reexamines how efficient management of externalities remains consistent with aggregate profit maximization under transaction costs and non-convexity. It indicates how pricing can support an efficient allocation under externalities, but this may require nonlinear pricing under non-convexity. And it explores how the minimization of transaction costs is an integral part of the efficient management of externalities.

The author would like to thank two anonymous reviewers for useful comments on an earlier draft of the chapter.

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Notes

  1. 1.

    In case where Pigouvian taxes/subsidies are not fiscally neutral, attaining efficiency requires redistribution of any fiscal surplus/deficit to consumers through lump sum payments [1, 3, 5]. Otherwise, Pigouvian taxes would not achieve “first-best” efficiency.

  2. 2.

    As discussed below, government intervention can still be helpful to achieve efficiency through quantity regulations and/or through nonlinear pricing policies.

  3. 3.

    Other options include individual transferable permits/quotas [25], and Varian [26]’s scheme involving a two-step mechanism that can implement efficient allocations as subgame-perfect equilibria under externalities.

  4. 4.

    Note that equity considerations (not addressed in this chapter) can also play a role in evaluating alternative externality management strategies.

  5. 5.

    In this context, when comparing government pricing policies versus government standards/quotas, economists often follow Pigou [5] and argue in favor of pricing policies on the ground that they are easier to implement and require less information (especially in the presence of heterogeneous agents). These issues are further discussed in Sect. 4.

  6. 6.

    Equation (3) includes as a special case the situation where there is no consumption externality, in which case individual benefit can be evaluated one consumer at a time and aggregate benefit is just the sum of individual benefits across all consumers [30, 31].

  7. 7.

    The conditions needed for the existence of a saddle-point in (6) are mild and are expected to hold under fairly general conditions. See Gould [38], Bertsekas [36], and Chavas and Briec [13]. In this chapter, we assume that these conditions hold.

  8. 8.

    Note that, under convexity and in the absence of externalities, the analysis would then reduce to the standard welfare theorems establishing close relationships between Pareto efficiency, decentralized decisions, and competitive markets (e.g., [7, 43]).

  9. 9.

    The line (G E2 G’) in Fig. 4 implies that the relative price (p2/p1) declines with y2, indicating that the price p2 decreases with y2. This is a situation of “volume discount” commonly observed in nonlinear pricing (e.g., [44]).

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Chavas, JP. (2022). Economics of Externalities: An Overview. In: Ray, S.C., Chambers, R.G., Kumbhakar, S.C. (eds) Handbook of Production Economics. Springer, Singapore. https://doi.org/10.1007/978-981-10-3455-8_13

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