It is frequently asserted that taxes on cigarettes and beer are regressive, because poor individuals spend a larger fraction of their income on such items than do better-off individuals. How would your estimate of the degree of regressivity be affected if you thought these commodities were produced by:
a. Competitive industries with inelastic supply schedules?
b. Monopoly with a linear demand schedule?
c. Monopoly facing a constant elasticity demand schedule?