開倉保證金
initial margin requirement
投資者必須就其本身的現貨或可按倉證券所支付相當於證券（可以保證金形式買入）買入價的某個百分比的款項。
Investors must pay the equivalent of the securities on its own cash or securities positions can be (in the form of deposit can buy) to buy a certain percentage of the price paid.