caution money of contract合同保证金
foreign currency caution money trades外汇保证金交易
Fourth chapters are foreign currency caution money business assurance system.
第四章是外汇保证金交易的担保制度。
参考来源 - 构建我国的外汇保证金交易法律制度初探N（名词） a sum of money deposited as security for good conduct, against possible debts, etc 保证金 [英国英语]