The Is Curve could be written as 多Y=C++G =A+C(Y-1)+f(1)+G [A+f()+G] 1-c(1-t)The IS Curve • Given the investment function, the equilibrium condition in product market could be written as [ ( ) ] 1 (1 ) 1 ( ) ( ) A f i G c t A c Y t Y f i G Y C I G + + − − = = + − + + = + +