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Investor Buying Power refers to the maximum dollar amount available to purchase securities without adding additional money to the account. Investor Buying Power includes both cash and margin.
For cash trades, Investor Buying Power refers to the maximum amount of cash available to purchase securities without adding additional amount to the account. Executed buy orders will reduce the buying power, while executed sell orders will increase the buying power.
For margin trades, Investor Buying Power refers to the amount available to purchase marginable securities without generating a margin call.