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盈透證券(IB)開戶及操作相關訊息

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發表於 2017-7-3 22:16:35 | 只看該作者 回帖獎勵 |倒序瀏覽 |閱讀模式

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Securities Margin Definition

For securities, the definition of margin includes three important concepts: the Margin Loan, the Margin Deposit and the Margin Requirement. The Margin Loan is the amount of money that an investor borrows from his broker to buy securities. The Margin Deposit is the amount of equity contributed by the investor toward the purchase of securities in a margin account. The Margin Requirement is the minimum amount that a customer must deposit and it is commonly expressed as a percent of the current market value. The Margin Deposit can be greater than or equal to the Margin Requirement. We can express this as an equation:


Margin Loan + Margin Deposit = Market Value of Security
Margin Deposit >= Margin Requirement

Borrowing money to purchase securities is known as "buying on margin". When an investor  borrows money from his broker to buy a stock, he must open a margin account with his broker, sign a related agreement and abide by the broker's margin requirements. The loan in the account is collateralized by investor's securities and cash. If the value of the stock drops too much, the investor must deposit more cash in his account, or sell a portion of the stock.
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