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α: calibrated so average coauthorship-adjusted count equals average raw count
In the past there was hardly any use of economic instruments in environmental policy, mainly command and control measures were used. More recently, ecological taxes as well as tradable permits became more popular and voluntary agreements have been implemented. Using the Public Choice approach we ask for the reasons of this wider acceptance of economic instruments. We conclude that the use of market based instruments in environmental policy has not increased very much and their impact on the actual situation is still rather low, but there is hope of a at least some increase in the future. Copyright 2003 by Kluwer Academic Publishers