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According to me,where the customer's and supplier's bargaining power is equal and a transaction is taken place according to the market conditions.
This is a Procurement relationship with Vendor - seperated by Long distance . Where the only purpose of getting in touch with the vendor is for generic items ( mainly traders ) who are storing and supporting standard manufactured products . The only purpose to be in touch with the vendor is to sucure the supply of some standard product which would be available ex-stock with them .