Margin requirement
From Investing Wiki
Definition
The minimum amount of cash that a customer must deposit in a brokerage account, as outlined by Regulation T of the Federal Reserve Board.
Generally Reg T requires $2,000 or half the purchase price of the securities purchased on margin, or half of the proceeds of short sales. Also known as "initial margin".
Bibliography
Dictionary of Finance and Investment Terms, Barron's Financial Guide, 2003.
