It is easy to define income for tax purposes

Which of the following tax systems could not be structured to satisfy conditions of vertical equity?

a. a proportional tax b. a regressive tax c. a progressive tax d. a lump-sum tax

When the price level falls the quantity of

a. consumption goods demanded rises, while the quantity of net exports demanded falls. b. consumption goods demanded and the quantity of net exports demanded both rise. c. consumption goods demanded and the quantity of net exports demanded both fall. d. consumption goods demanded falls, while the quantity of net exports demand rises.