A set of rules and regulations developed by the National Association of Securities Dealers (NASD). The rules are a standard which members of the NASD must follow regarding their duties to customers.
Investopedia Says:
Since the NASD is a self-regulatory organization the rules it enforces must be followed in addition to any commercial securities laws that have been passed. In a broad view, the Rules of Fair Practice cover the fair dealing, duty of loyalty, obligation of disclosure and other duties stockbrokers provide to their customers.
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