什麼是市價單？
市價單是指交易者要求劵商以市場價格立即執行交易 (買入或賣出) 的指示，它無需指定價格，交易者亦無法控制訂單成交價格。
1. 發出市價單有需要特別注意的地方嗎？
1) 由於市價單是以市場價格立即執行交易，訂單有可能分開不同的數量 / 價格成交。如以下為某證劵三個買賣價差之輪候隊伍：
| 買盤 | 賣盤 |
|---|---|
| 1000 $3.87 | $3.88 2000 |
| 2000 $3.86 | $3.89 3000 |
| 2000 $3.85 | $3.90 1000 |
若以市價單買入 5000 股，最終成交結果為$3.88@2000, $3.89@3000 若以市價單賣出 5000 股，最終成交結果為$3.87@1000, $3.86@2000, $3.85@2000
2) 如個別證劵流通性不足或沒有買/賣盤，可能會導致訂單未能全數成交或無法成交，未成交之部份或整筆訂單會被自動撤單。
3) 交易者無法控制市價單訂單的成交價格，上午/中午開市時由於需要處理開市前囤積的訂單，可能導致成交價偏離。當中，預埋市價單更具不可預知性。
4) 市價單會以當前價格 *1.2 市價單乘數凍結購買力，乘數或會因應市況調整。當訂單成交或撤銷，會釋放部份 (除成交金額外) 購買力。
2. 在什麼情況下，市價單會被拒絕？
如遇上市況波動，市價單在成功發送至交易所前，有機會因最佳買入價/賣出價大幅波動超出 5 個價差，指示未能即時配對而被取消，或因其他特殊情況 (如流通性不足) 而不獲接納/未能成交。
因此，我們建議你於提交指示後，打開長橋 App > 資產 > 訂單查詢查閱訂單執行狀況。
關鍵要點：
- 核心特徵
- 按當前市場價格立即執行，不保證最終成交價格。
- 可能分拆為不同價格/數量的多筆交易完成。
- 未成交部分會自動撤銷。
- 主要風險
- 流動性不足時可能出現部分或全部無法成交。
- 開盤時段因訂單積壓可能導致價格顯著偏離。
本文僅供參考，不構成任何投資建議。
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