We provide a model of hierarchical organization where artificial agents with limited individual capacities allocate their efforts in two activities. Different incentives schemes are considered and individual diversity and social norms are approached. Introduction The Moral Hazard literature approaches multi-agent relationships in different ways. Among them, the joint production models provide i...

In this work, we extend the model of Bonabeau et al. in the case of scale-free networks. A sharp transition is observed from an egalitarian to an hierarchical society, with a very low population density threshold. The exact threshold value also depends on the network size. We find that in an hierarchical society the number of individuals with strong winning attitude is much lower than the numbe...

BibSonomy is a web-based social resource sharing system which allows users to organise and share bookmarks and publications in a collaborative manner. Apart from standard folksonomy features such as an intuitive user interface, navigation along all dimensions, or browser integration via RSS feeds, BibSonomy provides tag hierarchies, group management and privacy features, and numerous import and...

In the early Vedas, caste was divided into four categories: Brahmins; Kshatriya; Vaishyas; and Shudras. It is interesting to note that Brahmins (the priestly caste) were given a higher position, while Kshatriya warrior position of king. This structure, along with long-standing gender inequality, has remained in place throughout history. this article, we will look at these dynamics through lens ...

This paper develops a theory of interpersonal status hierarchies that builds on and challenges traditional models of cumulative advantage. Cumulative advantage models predict stability in interpersonal status hierarchies, where status is defined by asymmetries in social relationships. According to strict cumulative advantage, initial status differences are exaggerated over time, making upward o...

Dominance hierarchies pervade animal societies. Within a static social environment, in which group size and composition are unchanged, an individual's hierarchy rank results from intrinsic (e.g. body size) and extrinsic (e.g. previous experiences) factors. Little is known, however, about how dominance relationships are formed and maintained when group size and composition are dynamic. Using a f...

Rich hierarchical structures are common across many disciplines, making the discovery of hierarchies a fundamental exploratory data analysis and unsupervised learning problem. Applications with natural hierarchical structure include topic hierarchies in text (Blei et al. 2010), phylogenies in evolutionary biology (Felsenstein 2003), hierarchical community structures in social networks (Girvan a...