Fig. 2: A schematic diagram showing the behavior of a social-type actor.

The resource patch network is represented by the black nodes and solid black lines. Filled black circles are patches with resources and open circles are empty patches. Red, yellow, blue and green nodes are individual actors and the dashed lines represent their social ties. Here, the red actor is allowed to use his social ties for collecting resources, and by chance he uses the tie connected to the green actor. The red actor then randomly picks a patch near the green actor (one of the nodes circled in red) and takes away a resource if it exists. Note that an actor immediately takes away a resource once he occupies a patch; therefore in the figure, the patches occupied by red, yellow, blue, and green actors have no resources left.