The Coevolution of Individual Economic Characteristics and Socioeconomic   Networks
  The opinion dynamics of economic agents is modeled with the link structure influenced by the resulting opinions: Links between people of nearly the same opinion are more stable than those between people of vastly different opinions. A simple scaling law describes the number of surviving final opinion as a function of the numbers of agents and of possible opinions. 
Dietrich Stauffer, Martin Hohnisch and Sabine Pittnauer