Answer the question on the basis of the following before-tax consumption schedule for a closed economy. Refer to the data. If a lump-sum tax (the same tax amount at each level of GDP) of $40 is imposed in this economy, the tax system: Select one: a. is regressive b. is proportional c. is progressive d. is aggressive e. None of the choices Answer the question on the basis of the following before-tax consumption schedule for a closed economy. Refer to the data. If a lump-sum tax (the same tax amount at each level of GDP) of $40 is imposed in this economy, the tax system: Select one: a. is regressive b. is proportional c. is progressive d. is aggressive e. None of the choices