Rafael • April 25, 2025

【DSE ECON】 GOVERNMENT INTERVENTION 喺表點移位﹖

同學仔做econ計數題總係衝唔出自己嘅心魔,覺得反正是計不了,其實識玩一定玩計數,因為答案好certain


3幅圖教大家搞掂表上徵稅/派津貼題型


STEP NO 1 | 收稅case預多行出嚟當supplier要俾哂稅,直接從價格減走稅項,得出圖1 第2行嘅supplier實收


STEP NO 2 | 按呢行supplier實收,重新調節QS,原本supplier收$10、$11只做300及400隻,放返落supplier實收個$10同$11度


STEP NO 3 | 稅前均衡點喺$12(500隻成交),稅後均衡點喺$14(300隻成交),同每個答案拼一拼對錯


A. 新成交係300隻,每隻$4稅,總稅收$1200 good bye son

B. 總收益冇講稅前稅後當佢稅後$14*300 -12*500 少$1800即走

C.consumer 俾$14-12稅,$2同supplier一樣$4-$2 冇彈性分野

D. Substitute 因為你貴咗 demand升TR升


一般玩郁表學死一邊(either QS / QD)都夠做,但學齊兩邊可立自己於不敗之地,如個郁QD ,頭先講圖1第二行就要改做Consumer實俾,全加$4,加完將原來收$14、$15會買嘅300、200隻拉返上consumer實俾果14、15度,再一次睇到均衡點喺300=300,實俾$14,同QS個case一模一樣

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