Fixed rates and institutional membership : hearings before the Subcommittee on Securities of the Committee on Banking, Housing, and Urban Affairs, United States Senate, Ninety-third Congress, first session on S. 470, to amend the Securities Exchange Act of 1934 to regulate the transactions of members of national securities exchanges, to amend the Investment Company Act of 1940 and the Investment Advisers Act of 1940 to define certain duties of persons subject to such acts, and for other purposes : S. 488, to amend the Securities Exchange Act of 1934 to prohibit minimum commission rates, and to regulate the transactions of members of national securities exchanges, February 20, 21, and 22; and March 15, 1973.