is曲线不是不考虑政府购买和净出口吗？
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2018062003000220 Y = 15,592.7 – 73.2r. Y =12,292.7 – 53.8r A is correct. Starting with the basic G intity Y = C + I + G + (X – M) ansubstituting for eaexpenture component using the equations above gives Y = 2,000 + 0.7(Y – T) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y Substituting in the tequation ansolving for Y, we get Y = 2,000 + 0.7(Y + 200 – 0.3Y) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y = 5,040 + 0.59Y – 30r Y = 12,292.7 – 73.2r The finequation is the IS curve. It summarizes combinations of income anthe reinterest rate whiincome anexpenture are equal. Equivalently, it reflects equilibrium in the goo market. 考点IS curve 解析从基本的G等式Y = C + I + G + (X M)开始，用上面给出的方程替换每个支出部分，即 Y = 2,000 + 0.7(Y – T) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y 再代入税收方程求解Y，得到 Y = 2,000 + 0.7(Y + 200 – 0.3Y) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y = 5,040 + 0.59Y – 30r Y = 12,292.7 – 73.2r 最后一个方程是is曲线。它总结了收入与支出相等时的实际利率的组合。同样，它反映了商品市场的均衡。 因此只有A正确。 请问这里G不用扣除T来计算吗 有点混淆了
NO.PZ2018062003000220 Y = 15,592.7 – 73.2r. Y =12,292.7 – 53.8r A is correct. Starting with the basic G intity Y = C + I + G + (X – M) ansubstituting for eaexpenture component using the equations above gives Y = 2,000 + 0.7(Y – T) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y Substituting in the tequation ansolving for Y, we get Y = 2,000 + 0.7(Y + 200 – 0.3Y) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y = 5,040 + 0.59Y – 30r Y = 12,292.7 – 73.2r The finequation is the IS curve. It summarizes combinations of income anthe reinterest rate whiincome anexpenture are equal. Equivalently, it reflects equilibrium in the goo market. 考点IS curve 解析从基本的G等式Y = C + I + G + (X M)开始，用上面给出的方程替换每个支出部分，即 Y = 2,000 + 0.7(Y – T) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y 再代入税收方程求解Y，得到 Y = 2,000 + 0.7(Y + 200 – 0.3Y) + 400 + 0.2Y – 30r + 1,500 + 1,000 – 0.1Y = 5,040 + 0.59Y – 30r Y = 12,292.7 – 73.2r 最后一个方程是is曲线。它总结了收入与支出相等时的实际利率的组合。同样，它反映了商品市场的均衡。 因此只有A正确。 請問稅收方程的公式是？
请问为什么不是G-T？
