Before revision: In the pooling and sharing mechanism of multiplicatively grown individual resources, the evolution of cooperation is uniquely determined by the physical traits of the population.
After revision: In contrast to game-theoretic interaction models with additive payoffs, the temporal evolution of natural and artificial systems in often governed by a multiplicative process. In evolutionary biology, these systems are studied within the general framework of fluctuating environments, where the individual entities are subject to spatio-temporal fluctuations in the environmental conditions. In these environments, evolutionary behavior may emerge that essentially differs from the one observed in standard models. The study of the physical traits of the population.