Margin
A percentage of the total price of a transaction that a trader is required to deposit as collateral to open a position is known as margin. The money that is borrowed from a brokerage to purchase securities is also known as margin.
The amount of equity that is needed for investment in securities that is purchased on credit is also known as margin.
Margin can also be arrived at by taking the face value of the loan that one has borrowed from the broker to purchase a security minus value of the pledged collateral.
It is important for the margin to be maintained always.  In cases where the amount in the margin account falls below the required minimum, the broker will give a maintenance call to the investor and he will have to deposit the money that is required to reach the margin maintenance level for that account.
 
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