< Back to Article
Evolutionary Establishment of Moral and Double Moral Standards through Spatial Interactions
Figure 5
Resulting fractions of the four strategies C, D, I, and M, for random regular graphs as a function of the punishment fine 
.
The graphs were constructed by rewiring links of a square lattice of size 
with probability 
, thereby preserving the degree distribution (i.e. every player has 4 nearest neighbors) [59]. For small values of 
, small-world properties result, while for 
, we have a random regular graph. By keeping the degree distribution fixed, we can study the impact of randomness in the network structure independently of other effects. An inhomogeneous degree distribution can further promote cooperation [37]. The results displayed here are averages over 10 simulation runs for the model parameters 
, 
, and 
. Similar results can be obtained also for other parameter combinations.
doi: https://doi.org/10.1371/journal.pcbi.1000758.g005