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Optimal Sustainable Policies Under Pollution Ceiling: the Demographic Side

Published online by Cambridge University Press:  20 June 2014

R. Boucekkine ,
B. Martinez  and
J.R. Ruiz-Tamarit
R. Boucekkine*
Affiliation:
Aix-Marseille University (Aix-Marseille School of Economics), CNRS and EHESS, France
B. Martinez
Affiliation:
Department of Quantitative Economics, Universidad Complutense de Madrid, Spain
J.R. Ruiz-Tamarit
Affiliation:
Department of Economic Analysis, Universitat de València, Spain, and IRES Department of Economics, Université Catholique de Louvain, Belgium
*
⋆Corresponding author. E-mail: [email protected]
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Abstract

We study optimal sustainable policies in a benchmark logistic world (where both population and technological progress follow logistic laws of motion) subject to a pollution ceiling. The main policy in the hands of the benevolent planner is pollution abatement, ultimately leading to the control of a dirtiness index as in the early literature of the limits to growth literature. Besides inclusion of demographic dynamics, we also hypothesize that population size affects negatively the natural regeneration or assimilation rate, as a side product of human activities (like increasing pollution, deforestation,...). We first characterize optimal sustainable policies. Under certain conditions, the planner goes to the pollution ceiling value and stays on, involving a more stringent environmental policy and a sacrifice in terms of consumption per capita. Second, we study how the sustainable problem is altered when we depart from the logistic world by considering exponential technical progress (keeping population growth logistic). It’s shown that, as expected, introducing such an asymmetry widens the margins of optimal policies as sustainable environmental policies are clearly less stringent under exponential technical progress. Third, we connect our model to the data, using in particular UN population projections.

Keywords

limits to growthsustainable policyoptimal growthdemographic dynamicspollution ceiling
Type
Research Article
Information
Mathematical Modelling of Natural Phenomena , Volume 9 , Issue 4: Optimal control , 2014 , pp. 38 - 64
Copyright
© EDP Sciences, 2014

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