2 Solving for△Y Y=C+I+G equilibrium condition △Y=△C+△I+△G in changes △C+△G because I exogenous =MPC×△Y+△G because△C=MPC△Y Collect terms with△Y Finally,solve for△Y: on the left side of the equals sign(等号)： ×△G (1-MPC)xAY=△G CHAPTER 10 Aggregate Demand I slide 11 CHAPTER 10 Aggregate Demand I slide 11 Solving for Y Y C I G = + +  =  +  +  Y C I G =   +  MPC Y G =  +  C G (1 MPC) −  =  Y G 1 1 MPC Y G    =       − equilibrium condition in changes because I exogenous because C = MPC Y Collect terms with Y on the left side of the equals sign(等号): Finally, solve for Y : 2