Y=C+I+G+X-M
Y=(20+0.7Y)+100+90+0+0
Y=0.7Y+210
Y-0.7Y=0.3Y=210
=>Y=700
18 根據簡單的凱因斯模型,若已知消費函數為C = 20+0.7Y,且投資I =..-阿摩線上測驗