橫向價差、水平套利、跨期買賣
horizontal spread
一種套做期權的技術，同一級別和同種附屬股票的期權合約，且有同樣的敲定價格，但到期日不同。
One kind of sets the option to do technology, the subsidiary stock options contracts on the same level and the same species and the same strike price but different expiration date.