Assume that initially G is $100 and equilibrium real GDP demanded is $1000. if the multiplier is 4 and G increases to $100, real GDP demanded will increase: (a) by $100 (b) by $2000 (c) by $1000 (d) by $1400 (e) by $2000 答案是(D) 這題感覺(?)是簡單的 不過怎麼想都沒頭緒@@ 麻煩大家了!