No investment adviser, unless exempt from registration pursuant to section 80b-3(b) of this title, shall make use of the mails or any means or instrumentality of interstate commerce, directly or indirectly, to enter into, extend, or renew any investment advisory contract, or in any way to perform any investment advisory contract entered into, extended, or renewed on or after November 1, 1940, if such contract -
Paragraph (1) of subsection (a) of this section shall not -
For purposes of paragraph (2) of subsection (b) of this section, the point from which increases and decreases in compensation are measured shall be the fee which is paid or earned when the investment performance of such company or fund is equivalent to that of the index or other measure of performance, and an index of securities prices shall be deemed appropriate unless the Commission by order shall determine otherwise.
As used in paragraphs (2) and (3) of subsection (a) of this section, "investment advisory contract" means any contract or agreement whereby a person agrees to act as investment adviser to or to manage any investment or trading account of another person other than an investment company registered under subchapter I of this chapter.