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Diffuse competition due to niche overlap between actors without (direct) ties with each other, constrains their structural autonomy. This is not dealt with in Burt's mathematical model of his well-known structural holes theory. We fix his model by introducing a network measure of niche overlap. In structural holes, the social structure of competition, Burt(More)
Resource partitioning theory claims that " Increasing concentration enhances the life chances of specialist organizations. " We systematically think through this theory, specify implicit background assumptions, sharpen concepts, and rigorously check the theory's logic. As a result, we increase the theory's explanatory power, and claim— contrary to received(More)
Humans often coordinate their social lives through norms. When a large majority of people are dissatisfied with an existing norm, it seems obvious that they will change it. Often, however, this does not occur. We investigate how a time lag between individual support of a norm change and the change itself hinders such change, related to the critical mass of(More)
A significant challenge is to explain how people cooperate for public goods. The problem is more difficult for people who hardly know one another, their public good is unclear at the outset and its timing and costs are uncertain. However, history shows that even under adverse conditions, people can cooperate. As a prelude to cooperation , people can(More)
" The Strength of Weak Ties " argument (Granovetter 1973) says that the most valuable information is best collected through bridging ties with other social circles than one's own, and that those ties tend to be weak. Aral and Van Alstyne (2011) added that to access complex information, actors need strong ties (" high bandwidth ") instead. These insights I(More)
Social networks can be embedded in an n-dimensional space, where the dimensions may reveal or denote underlying properties of interest. When the pertaining actors occupy niches of resources in this space, e.g., organizational niches of affiliates, we show there exists a non-monotonic effect of dimensionality change. Depending on niche width, relatively(More)