A number of recent studies on taxation in the presence of externalities in a second-best framework consider the implications of taking into account the feedback effects of environmental quality. This paper explores by means of GEM-E3, a computable general equilibrium model for the EU countries, the importance of the feedback effects of the health related benefits from an environmental policy. The modelling framework implemented in GEM-E3 allows for three channels through which the feedback can occur: a decrease in medical expenditure, an increase in the consumers' available time and an increase of labour productivity in the production sectors. The results show that the explicit modelling of the health related effect of air pollution on consumers and producers allows for a better evaluation of the impact of environmental policies on private consumption and employment. However, in terms of global effect, the impacts of the feedback are small, compared to the standard GEM-E3 model where the health related benefits are evaluated ex-post.applied general equilibrium model, non-separable externalities, CO2 tax, environment, ancillary benefits
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