1907 18-4 THE AGGREGATE-DEMAND CURVE The four components of GDP ()contribute to the aggregate demand for goods and services. Y=C+I +G NX Economics ECONOMICS MANAGEMENT SCHOOL,TONGJI UNIVERSITY Economics ECONOMICS & MANAGEMENT SCHOOL, TONGJI UNIVERSITY 18-4 THE AGGREGATE-DEMAND CURVE • The four components of GDP (Y) contribute to the aggregate demand for goods and services. Y = C + I + G + NX