Fiscal policy: IS curve shifts R RI R1 B B R2 R2 IS1 IS IS2 IS2 Y2 Y1 Y Y2 YI Total taxt, Is shifts to the left Tax ratet, Is becomes more steep 友学经济学院R LM IS1 Y1 Y R1 A IS2 B R2 Y2 R LM IS1 Y1 Y R1 A IS2 B R2 Y2 Total tax↑, IS shifts to the left Tax rate↑, IS becomes more steep Fiscal policy：IS curve shifts