“…Traditionally, taxes have been described as regressive, propor tional, or progressive depending on whether the ratio of annual taxes to annual income falls, remains constant, or rises across individuals ranked by annual income levels. By this standard consumption sales • taxes are generally regarded as regressive because the average propen* sity to consume from annually measured income declines as annual income rises,-^Various authors [1,2,6,8,9] have noted the defir ciencies of measuring incidence in terms of annual data and some have considered incidence in terms of the relation between lifetime taxes and lifetime income. However, two of the most widely read public finance textbooks [6,7] contain incorrect conclusions regarding the lifetime incidence of consumption sales taxes.…”