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A single human can be involved in a limited number of social relationships,and the distribution of strengths of such relationships shows significant skew.This skewness suggests that the costs and benefits of the social interactionsrequired to bond with others (social grooming) depend on the socialrelationship strength: if they involved uniform costs and benefits, thedistribution would not be skew. Here, we show that the cost of social groomingincreases with the social relationship strength, and its gradient determinesthe structures of these relationships in society as evident from an analysis ofdata from six communication systems. This may be due to an increase incommunication volumes, such as number of characters and duration of calls,along with an increase in the social relationship strength. We tested thishypothesis using an individual-based simulation where social grooming costswere assumed to increase linearly with the social relationship strength; thisis the simplest assumption. The results indicated that this model fitted alldata sets, i.e., it showed an explanation capacity for the phenomenon.Additionally, an analysis of this simulation suggested that the gradient ofsocial grooming costs increases the width and shallowness of socialrelationships in its communication system.

Limitations of Time Resources in Human Relationships Determine Social Structures