pt. 1. The full service firms. Merrill Lynch & Co. -- Morgan Stanley, Dean Witter & Co. -- Salomon Smith Barney Holdings Inc. -- pt. 2. The retail brokers. PaineWebber Inc. -- Prudential Securities Inc. -- pt. 3. The trading powerhouses. Bear Stearns Cos. -- Lehman Brothers Inc. -- pt. 4. The investment banks. Goldman, Sachs & Co. -- Credit Suisse First Boston Corp. -- pt. 5. The banks. J.P. Morgan & Co. -- Bankers Trust New York Corp. -- pt. 6. The exchanges. The New York Stock Exchange -- The Nasdaq Stock Market -- pt. 7. The regulators. The Securities and Exchange Commission -- The Federal Reserve.