Levying a tariff on an imported good ______. Levying a tariff on an imported good ______. shifts the demand curve down for the good Not enough information to determine shifts both supply and demand shifts the supply curve up for the goodTo achieve efficiency, a carbon tax should be set at ____ To achieve efficiency, a carbon tax should be set at ____ zero. the cost of reducing emissions at the dirtiest plant. the social cost of carbon. the current price of permits in the nearest carbon market