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Environmental policy and time consistency - emissions taxes and emissions trading

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  • Kennedy, Peter W.
  • Laplante, Benoit

Abstract

The authors examine policy problems related to the use of emissions taxes, and emissions trading, two market-based instruments for controlling pollution by getting regulated firms to adopt cleaner technologies. By attaching an explicit price to emissions, these instruments give firms an incentive to continually reduce their volume of emissions. Command, and-control emissions standards create incentives to adopt cleaner technologies only up to the point where the standards are no longer binding (at which point the shadow price on emissions falls to zero). But the ongoing incentives created by the market-based instruments are not necessarily right, either. Time-consistency constraints on the setting of these instruments limit the regulator's ability toset policies that lead to efficiency in adopting technology options. After examining the time-consistency properties of a Pigouvian emissions tax, and of the emissions trading, the authors find that: 1) If damage is linear, efficiency in adopting technologies involves either universal adoption of the new technology, or universal retention of the old technology, depending on the cost of adoption. The first best tax policy, and the first-best permit-supply policy are both time-consistent under these conditions. 2) If damage is strictly convex, efficiency may require partial adoption of the new technology. In this case, the first-best tax policy is not time-consistent, and the tax rate must be adjusted after adoption has taken place (ratcheting). Ratcheting will induce an efficient equilibrium if there is a large number of firms. If there are relatively few firms, ratcheting creates too many incentives to adopt the new technology. 3) The first-best supply policy is time-consistent if there is a large number of firms. If there are relatively few firms, the first-best supply policy may not be time-consistent, and the regulator must ratchet the supply of permits. With this policy, there are not enough incentives for firms to adopt the new technology. The results do not strongly favor one policy instrument over the other, but if the point of an emissions trading program is to increase technological efficiency, it is necessary to continually adjust the supply of permits in response to technological change, even when the damage is linear. This continual adjustment is not needed for an emissions tax when damage is linear, which may give emissions taxes an advantage over emissions trading.

Suggested Citation

  • Kennedy, Peter W. & Laplante, Benoit, 2000. "Environmental policy and time consistency - emissions taxes and emissions trading," Policy Research Working Paper Series 2351, The World Bank.
  • Handle: RePEc:wbk:wbrwps:2351
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    References listed on IDEAS

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    Cited by:

    1. Fischer, Carolyn, 2008. "Emissions pricing, spillovers, and public investment in environmentally friendly technologies," Energy Economics, Elsevier, vol. 30(2), pages 487-502, March.
    2. Till Requate & Wolfram Uunold, 2001. "On the Incentives Created by Policy Instruments to Adopt Advanced Abatement Technology if Firms are Asymmetric," Journal of Institutional and Theoretical Economics (JITE), Mohr Siebeck, Tübingen, vol. 157(4), pages 536-554, December.
    3. von Döllen, Andreas & Requate, Till, 2007. "Environmental Policy and Incentives to Invest in Advanced Abatement Technology if Arrival of Future Technology is Uncertain - Extended Version," Economics Working Papers 2007-04, Christian-Albrechts-University of Kiel, Department of Economics.
    4. Eva Camacho-Cuena & Till Requate & Israel Waichman, 2012. "Investment Incentives Under Emission Trading: An Experimental Study," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 53(2), pages 229-249, October.
    5. Dagmar Nelissen & Till Requate, 2007. "Pollution-reducing and resource-saving technological progress," International Journal of Agricultural Resources, Governance and Ecology, Inderscience Enterprises Ltd, vol. 6(1), pages 5-44.
    6. Bramoulle, Yann & Olson, Lars J., 2005. "Allocation of pollution abatement under learning by doing," Journal of Public Economics, Elsevier, vol. 89(9-10), pages 1935-1960, September.
    7. Mirzha de Manuel Armendía, 2011. "Market Efficiency in the EU Emissions Trading Scheme. An outlook for the third trading period," Bruges European Economic Research Papers 20, European Economic Studies Department, College of Europe.
    8. Fischer, Carolyn & Newell, Richard G., 2008. "Environmental and technology policies for climate mitigation," Journal of Environmental Economics and Management, Elsevier, vol. 55(2), pages 142-162, March.

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