We identify and estimate heterogeneous social effects within groups of individuals that make binary choices. These effects, which include peer contextual are modeled through unobserved influence matrices summarize how the members each group affect other’s outcomes. recover parameters in as well unknown by exploiting these linked to reduced-form multiple characteristics. Monte Carlo experiments ...

this study tries to provide a virtual image of the structure and design of facenama, cloob, facebook and google+ social networks. the main question in this study is which variable or variables are differ in the structure and design of social networks of iranian and non-iranian. content analysis has been used in this study. content analysis is a research method to describe the objective, systema...

On the human brain activities in social interaction, there may be associated with some kind of reinforcement mechanism like crowd psychology or mimicking drive, or sometimes, creating a social mechanism like punishments. Some of such reinforcement mechanisms can be interpreted with a nonlinear Polya urn process of which W. Brian Arthur(1994) is fond. He called structure as emergence of a new co...

Service-Oriented Multi-Agent Systems (SOMAS) are dynamic systems populated by heterogeneous agents which can enter or leave the system dynamically. As a consequence of the heterogeneity feature, organizational concepts such as roles are useful to facilitate the coordination in the system. In addition, agent functionality should be modelled as services in order to allow heterogeneous agents or o...

We develop a dynamic structural model to examine the e¤ects of di¤ering beliefs of the manager and outsider investors regarding the pro…tability of a …rm’s projects and managershareholder agency con‡icts on its capital structure. The manager receives dynamic incentives through explicit contracts with shareholders whose implementation through …nancial securities leads to a dynamic capital struct...