game theory (Other Keyword)

DOCUMENT Citation Only Xavier Rubio-Campillo. Enrico Crema.

Several human activities require an optimal number of individuals to maximise their utility, often leading to the coexistence of positive and negative frequency dependence. This generates unstable equilibria, as group close to the optimal size will be invaded by joiners who will increase their fitness by becoming new members, leading either beneficial or detrimental effects to the incumbent members. If a group is optimally sized, incumbent member will experience a decline in fitness, while...