Both mark-to-market and margins are used by markets to reduce (eliminate) the risk of non-payment by purchasers of the derivative products if prices move against them.保證金和日盯式都是為了避免衍生品購買方的違約風險，萬一期貨價格逆向，無法支付虧損。

Mark-to-market closes all the open deals at the end of each day at that day’s settlement price, and opens them again at the start of the following day. The notional profit or loss on the deals is then calculated and the margin account is adjusted accordingly on a daily basis.日盯式是每日結算當天的名義盈利和虧損，一旦期貨市場虧損，且保證金低于要求，則需要公司額外融資來填補。這會影響公司正常現金流，其他活動的資金可能不夠。

If losses are made, then the company may have to deposit extra funds with its broker if the margin account falls below the maintenance margin level. This may affect the company’s ability to plan adequately and ensure it has enough funds for other activities. On the other hanc, extra cash accuring from the notional profits can be withdrawn from the broker account of needed.如果帳戶盈余，則可以取現補充公司賬戶現金流。

Each time a market-traded derivative product is opened, the purchaser needs to deposit a margin (initial margin) with the broker, which consists of funds to be kept with the broker while the position is open.保證金則是 broker 需要公司在開倉后存 在賬戶上的一定額度的資金，低于保證金時，需要及時填補。

As stated above, this amount may change daily and would affect Daikon Co’s ability to plan for its cash requirements but also open positions require that funds are tied up to support these positions and cannot be used for other purposes by the company. 綜上所述，期貨是每日結算，所以會影響公司的正常現金流安排。只要是開倉狀態，也需要有一定的保證金在賬上，不可以拿這筆錢做其他用途了。