Information Analyzer & Advisor
Prospective buyers and sellers must know about one another.
Buyers and seller must assess the credibility and trust each other.
Aggregators & Distributors
Producers （Sellers）must be able to get their poducts to consumers(Buyers).
Buyers must know that the promiser sellers make are legitimate and verifiable.
Buyers and sellers must ensure that the commitment to transcact is honored.
Buyers and sellers must be assured of redressin case of a conflict.