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16. a. In what ways are taxes on emissions, and tradable permits similar with respect to their objectives? pb. How do they differ from taxes on output of the firms creating negative externalities? What policy is preferable from the point of view of reducing the external costs of a negative environmental externality: a tax on output or a tax on emission? C. termes ad promis hecho Jen hor 16. a. b. In what ways are taxes on emissions, and tradable permits similar with respect to their objectives? How do they differ from taxes on output of the firms creating negative externalities? What policy is preferable from the point of view of reducing the external costs of a negative environmental externality: a tax on output or a tax on emission? c