NASD rules that relate to a broker-dealer's conduct of business. In short, the basic rules are to: * Promote just and equitable principles of trade for the protection of investors; * Prevent fraud and manipulative practices; * Consult with government and investors on matters of common concern and; * Prevent excessive commissions and charges. All exchanges and securities associations have similar rules. See: Broker; Commission; Dealer; Know Your Customer; NASD; Securities Industry Association