  In an economic market, sellers, infomediaries and customers constitute an
economic network. Each seller has her own customer group and the seller's
private customers are unobservable to other sellers. Therefore, a seller can
only sell commodities among her own customers unless other sellers or
infomediaries share her sale information to their customer groups. However, a
seller is not incentivized to share others' sale information by default, which
leads to inefficient resource allocation and limited revenue for the sale. To
tackle this problem, we develop a novel mechanism called customer sharing
mechanism (CSM) which incentivizes all sellers to share each other's sale
information to their private customer groups. Furthermore, CSM also
incentivizes all customers to truthfully participate in the sale. In the end,
CSM not only allocates the commodities efficiently but also optimizes the
seller's revenue.
