  This paper studies a stylized model of a monopoly data seller when
information-sharing network exists among data buyers. We show that, if the
buyers' prior information is sufficiently noisy, the optimal selling strategy
is characterized by a maximum independent set, which is the largest set of
buyers who do not have information-sharing link at all. In addition, the
precision of the seller's data decreases in the number of information-sharing
links among buyers, but it is higher than the socially efficient level of
precision.
