 Since these structured competitions are implemented "for the narrow reason" that, in a reasonably competitive market, they generate social benefits through positive externalities, "adversarial ethics" are acceptable in the circumscribed and limited role of markets.Indeed, economic actors engaged in market transaction "must be given a fairly broad exemption from the norms of equality or fairness".However, they must be held accountable to the fundamental principles required to have a competitive and efficiency promoting market.