We usually monitor y , the average of over all buyers. Figures 2a and 3a, for instance, display simplex plots at different steps of a simulation. Each agent is represented by a small circle whose colour or shade is specific to the agent. The circle's position is the barycenter of the triangle for a choice of weights proportional to the fidelity of the agent to the 3 shops each of which corresponds to one of the 3 apexes of the triangle. Proximity to one corner is an indication of fidelity to the shop corresponding to that corner.
Agents represented by circles which are close to the center are undecided.