(1)一个也是说穷人没有有钱人买什么东西划算
(2)一个有累进概念的
(3)纽约等城市房子供给少,所以降税会提高房价
(4)low income buy expensive cars have to pay more tax than high income buy in expensive cars
(5)food和cloths
(6)在学习并且有工作的学生可以得到income tax reduction on textbooks那个(760 Q51 V41) (7)还有一个就是purchaser没有得到benefit那个