Demand for good i: 9:=y+2;-7(p,-p),7>0 The aggregate demand:y=m-p In equilibrium,demand supply, i.e.9,=l→ P-p)=y+:-n,-p) 电子科大经管学院马捷 55  Demand for good i:  The aggregate demand: y = m - p  In equilibrium, demand = supply, i.e. i i i i i i y q p p z q y z p p          0 ( ), 0 电子科大经管学院 马捷 qi  li  ( ) ( ) 1 1 p p y z p p i    i  i    