document: Social percolation and the influence of mass media In the marketing model of Solomon and Weisbuch , people buy a product only if their neighbours tell them of its quality , and if this quality is higher than their own quality expectations . Now we introduce additional information from the mass media , which is analogous to the ghost field in percolation theory . The mass media shift the percolative phase transition observed in the model , and decrease the time after which the stationary state is reached
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