考虑下述的经济结构：消费：C=0．8(Q—T)；投资：I=20—0．4i；政府开支：G=10；税收：T=20；货币供给：Ms=50；货币需求：MD=(0．5Q—i)P。 a．找出IS曲线和凯恩斯乘数； b．假定价格水平为2，求LM曲线； c．求均衡利率和总需求(仍假定P=2)； d．求总需求曲线； e．如果政府支出增加至G=12，求它对于产出、利率和价格水平的影响。分析极端凯恩斯学派场合(假定P=2)和古典场合的情况(假定Q=60)o Consider the following structure of all economy： Consumption：C=0．8(Q一T) Investment：I=20—0．4i Government spending：G=10 Taxes：T=20 Money supply：Ms=50 Money demand：MD=(0．5Q—i)P a．Find the IS curve and the Keynesian multiplier． b．Find the LM curve，assuming that the price level is 2． c．Find the equilibrium interest rate and aggregate demand(continue to assume P=2)． d．Find the aggregate demand curve． e．Find the effects on output，the interest rate and the price level if government expendituresincrease to G=12．yze the extreme Keynesian case(assume P=2)and the classical case(assume Q=60)．