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Pollution havens: international empirical evidence using a shadow price measure of climate policy stringency

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Abstract

Given the ambiguous empirical results of previous research, this paper tests whether support for a climate policy-induced pollution haven effect and the pollution haven hypothesis can be found. Unlike the majority of previous studies, the analysis is based on international panel data and includes several methodological novelties: By arguing that trade flows of dirty goods to less dirty sectors may also be influenced by changes in policy stringency, trade information on primary, secondary, and tertiary sectors are included. In order to clearly differentiate between dirty sectors and sectors with high pollution abatement costs, separate measures for pollution intensity and policy stringency are implemented. For the former, two intensities, namely the sectors’ carbon dioxide emission intensity and the emission relevant energy intensity, are used to identify dirty sectors. For the latter, an internationally comparable, sector-specific measure of climate policy stringency is derived by applying a shadow price approach. Potential endogeneity between climate policy stringency, trade openness and the trade balance is controlled for by employing a dynamic panel generalized method of moments estimator. The results provide evidence for a pollution haven effect that is also present for non-dirty sectors, i.e., a sector’s net imports rise in general if the sector faces an increase in climate policy stringency. Moreover, a stronger pollution haven effect regarding carbon dioxide intensive and emission relevant energy-intensive sectors is revealed. However, no support for the stronger pollution haven hypothesis can be found.

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Notes

  1. In the context of climate policy and pollution havens the literature commonly refers to the issue of carbon leakage (Aldy and Pizer 2015; Frankel 2009).

  2. Likewise, Ederington et al. (2004) distinguish between a direct and an indirect effect.

  3. A detailed overview of the included countries can be found in Table 4.

  4. The shadow prices of emission relevant energy are also utilized in the subsequent analysis to determine the stringency of climate policy. In Sect. 3.2 the general idea and the estimation procedure of the shadow price approach are introduced. In short, the approach indirectly estimates private sector abatement costs by relying on economic theory and the choices made by firms, revealing their profit maximization behavior. Thereby, the shadow price of a polluting input can be defined as the potential reduction in expenditures on other variable inputs, which can be realized by using additional units of the polluting input while keeping the level of output constant (van Soest et al. 2006). Thus, if a polluting input, which is in the case of this paper emission relevant energy, is weakly regulated, then the price of the polluting input is relatively low and firms will choose to use relatively more of the polluting input. Such shadow prices can be determined by estimating a firm’s or a sector’s cost function.

  5. OECD is short for Organisation for Economic Co-operation and Development.

  6. Following the definition in the World Input–Output Database (WIOD) the difference between emission relevant energy use and gross energy use is that the former excludes the non-energy use, e.g., asphalt for road building, and the input for transformation, e.g., crude oil transformed into refined products, of energy commodities. While gross energy use is directly linked to expenditures for energy inputs, emission relevant energy use directly relates energy use to energy-related emissions.

  7. The pollution haven effect is measured as the first partial derivative of the economic activity M with respect to the environmental policy stringency P, i.e., \(\partial M/\partial P=\beta _1 \). Hence, a positive and significant coefficient \(\hat{{\beta }}_1 \) implies, ceteris paribus, that increasing the policy stringency results in larger net imports.

  8. In parts empirical studies using panel or time-series data lag the regulatory stringency measure P to see whether strict environmental regulation in the previous period results in changed economic activity (Cole and Elliot 2003).

  9. Instead of the variable trade openness research also commonly uses a measure of trade barriers, such as tariff rates, in order to determine the level of trade liberalization (Althammer and Mutz 2010; Ederington et al. 2004).

  10. A more detailed discussion of using average time-invariant policy stringency rather than general time-specific policy stringency is given in Ederington et al. (2004). Similar to their article, the estimates of the final pollution haven Eqs. (4)–(7) in Sect. 5 are not sensitive to this change in specification.

  11. Evidence for the pollution haven hypothesis can be revealed from \(\partial ^{2}M/\left( {\partial TO\partial \bar{{P}}} \right) =\beta _3 \). If the coefficient \(\hat{{\beta }}_3 \) is positive and significant, this implies that an increase in trade openness leads to larger increases in net imports for industries facing relatively higher environmental policy stringencies. As in Eqs. (1) and (2) the pollution haven effect is still determined by \(\partial M/\partial P\).

  12. Alternatively, in particular, tariff rates may be used to measure trade barriers. However, given that a significant number of countries, which this paper analyzes, have signed free trade agreements with each other, tariff rates are not regarded as an appropriate measure. An overview on other trade openness and policy measures is, for example, given in Rose (2004). He classifies 68 different indicators into seven categories, namely outcome-based measures of trade openness, adjusted trade flows, tariffs, non-tariff barriers, informal or qualitative measures, composite indexes, and measures based on price outcomes.

  13. Cole and Elliot (2003) reveal for US industry sectors that pollution-intensive sectors face high pollution abatement costs per value added and are relatively capital intensive.

  14. For instance, in the case of the German support of renewable energies the costs are passed on to clean industries and consumers, whereas energy-intensive firms are partly relieved from the financing and have to pay lower energy prices per kilowatt hour (Diekmann et al. 2012).

  15. As before, the impact of the regulatory stringency determines the pollution haven effect and the pollution haven hypothesis is analyzed based on the impact of the sector- and country-specific but time-invariant average regulatory stringency.

  16. For a detailed overview on the different approaches that researchers have used to measure the stringency of environmental policy and climate policy see Brunel and Levinson (2016) or Althammer and Hille (2016). The former group the approaches into five categories, namely private sector abatement costs, direct assessments of individual regulations, composite indexes, measures based on pollution and energy use, and measures based on public sector expenditures or enforcement.

  17. An overview of the strengths of the shadow price approach is given in van Soest et al. (2006) and Althammer and Hille (2016).

  18. Equation (8) represents the final specification of the shadow price equation, which is estimated in the system of seemingly unrelated regressions to quantify the measure of climate policy stringency. D is a country-, sector-, and time-specific dummy variable and \(\alpha _\mathrm{E}\) as well as \(\lambda _\mathrm{E}\) are the respective regression coefficients. Given the limited number of degrees of freedom, the time-specific effect is structured in five equivalent three-year time periods.

  19. Further regression estimates are available upon request.

  20. The rankings remain unchanged when the countries are ordered based on the average wedges.

  21. The WIOD data are not used directly to determine the country-level capital stocks, because extrapolating the data using prior growth rates seems problematic given the potential negative consequences of the world financial crisis starting in 2008.

  22. Table 9 in “Appendix 2” provides an overview of the 33 included sectors. The sectors are structured using the division-level ISIC Rev. 3.1. While sector-specific data certainly represent an improvement compared to prior multi-country studies, it needs to be acknowledged that some limitations remain due to the aggregation of sectors.

  23. For instance, if net imports are zero, a regular elasticity of net imports is going to infinity.

  24. In Table 10 in “Appendix 3” the elasticities of net imports are for comparison reasons reported for specifications including emission relevant energy use \(x_\mathrm{E}\) only, i.e., for the classic model using the shadow costs of emission relevant energy P and for the augmented models relying on the emission relevant energy use intensity \(x_\mathrm{E}\) /y. Further estimates are available upon request.

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Acknowledgements

Financial support by the German Federal Ministry for Education and Research (BMBF) in the framework of the project “Climate Policy and the Growth Pattern of Nations” is gratefully acknowledged. Moreover, the author would like to thank two anonymous referees for their valuable comments.

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Correspondence to Erik Hille.

Appendices

Appendix 1: Overview of the final variables

See Table 8.

Table 8 Used variables and their units of measurement\(^\mathrm{a}\)

Appendix 2: Sector overview

See Table 9.

Table 9 Included sectors and the respective division-level ISIC Rev. 3.1

Appendix 3: Estimates of the elasticity of net imports for the chemicals and metals sector

See Table 10.

Table 10 Estimates of the elasticity of net imports with respect to changes in climate policy stringency for specifications including emission relevant energy use \(x_{E}\) following Levinson and Taylor (2008)

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Hille, E. Pollution havens: international empirical evidence using a shadow price measure of climate policy stringency. Empir Econ 54, 1137–1171 (2018). https://doi.org/10.1007/s00181-017-1244-3

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