1907 17-5 Deriving the IS curve w AE=YAE-C+I(r2)+G ↓r台个I AE=C+I)+G →个AE △I Yi Y2 2 IS Y Y2 Economics ECONOMICS MANAGEMENT SCHOOL,TONGJI UNIVERSITY Economics ECONOMICS & MANAGEMENT SCHOOL, TONGJI UNIVERSITY 17-5 Y1 Y2 Y1 Y2 Deriving the IS curve r  I Y A E r Y AE =C +I (r1)+G AE =C +I (r2)+G r1 r2 AE =Y IS  AE I  Y