Margin equity consists of cash plus the market value of marginable securities in the account. (us.etrade.com)
You'll get this call when your equity falls below Vanguard Brokerage's house maintenance requirement, which is 35 % for most marginable securities. (investor.vanguard.com)
In investment terms, purchasing power is the dollar amount of credit available to a customer to buy additional securities against the existing marginable securities in the brokerage account. (investopedia.com)