The Behavioral Effects of Carbon Taxes - Experimental Evidence

Carbon taxes are a prominent policy instrument for decreasing the consumption of CO2-intensive goods in order to reduce the negative external effects involved in the production or consumption of such goods. A tax leads to higher consumer prices, which typically lowers consumption. In this paper we provide evidence from laboratory experiments showing that for directly lowering consumption, carbon taxes may be less effective than assumed because of unintended behavioral effects. Especially earmarking the revenues of a carbon tax for environmental purposes---a practice that is popular with voters and policy makers---can crowd out consumers' intrinsic motivation to avoid negative externalities. If this is the case, a carbon tax not only increases consumer prices but also raises consumers' willingness to pay for the taxed good, thus partly offsetting the price effect and lowering the consumption-reducing effect of the tax.