程式員的量化交易之路（23）--金融概念Margin保證金

margin：保證金

我們把它貼上，并加上我個人的翻譯。（翻譯不好莫怪）

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

借錢買證券。這種行為叫做基于保證金的交易

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.

在一個保證金賬戶中，某個資産（股票）所占目前該賬戶總市值的比例

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

一個更為寬泛的商業領域中，指的是一件商品的賣價減去它的成本。

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.

在可變利率借貸中，高出基準利率的部分，它就是貸方所獲得的利潤。

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.

借錢交易會加大交易承擔的風險，不管是盈虧都會相應的擴大。為了獲得更大的利潤，就意味着你需要承擔更大的風險。借錢交易還得承擔借貸利息這筆費用。倫家不會免費借錢給你的。

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.

加入你使用保證金賬戶進行期貨交易，那麼你需要繳納一定的保證金以承受市場的波動。

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

毛利率（收益-成本）是衡量一個公司表現的重要名額。

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%.

margin = mortage - treasury index