How to Turn an Industry Green: Taxes versus Subsidies
Environmental policies frequently target the ratio of dirty to green output within the same industry. To achieve such targets, the green sector may be subsidized or the dirty sector be taxed. We show that in a monopolistic competition setting, the two policy approaches have different welfare effects, depending on the design of the instrument (ad valorem versus unit instrument) and the initial situation (size of the dirty sector). For a strong green policy (a severe reduction of the dirty sector) a tax is the dominant instrument. If initially the dirty sector is important, then for moderate policy targets a subsidy may be the superior tool. These findings have implications for policies such as the Californian Zero Emission Bill. Copyright Springer Science+Business Media, Inc. 2005
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