Why is interdependence the norm? Interdependence occurs because people are better off when they specialize and trade with others Harcourt, Inc. items and derived items copyright C 2001 by Harcourt, Inc.Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc. Why is interdependence the norm? Interdependence occurs because people are better off when they specialize and trade with others