Margin

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DEFINITION of 'Margin'

1. Borrowed money that is used to purchase securities. This practice is referred to as "buying on margin".

2. The amount of equity contributed by a customer as a percentage of the current market value of the securities held in a margin account.

3. In a general business context, the difference between a product's (or service's) selling price and the cost of production.

4. The portion of the interest rate on an adjustable-rate mortgage that is over and above the adjustment-index rate. This portion is retained as profit by the lender.

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BREAKING DOWN 'Margin'

1. Buying with borrowed money can be extremely risky because both gains and losses are amplified. That is, while the potential for greater profit exists, this comes at a hefty price - the potential for greater losses. Margin also subjects the investor to a number of unique risks such as interest payments for use of the borrowed money.

2. For example, if you hold futures contracts in a margin account, you have to maintain a certain amount of margin depending on how the market value of the contracts change.

3. Gross profit margin (which is the difference between revenue and expenses) is one measure of a company's performance.

4. The formula for calculating the interest rate on an adjustable-rate mortgage is the adjustment-index rate (e.g. Treasury Index) plus the percentage of the margin. For example, if the Treasury Index is 6% and the interest rate on the mortgage is 8%, the margin is 2%.

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