escalation

详细解释:n. 扩大, 增加
【经】 调查, 价格调整

英语解释：

名词 escalation:

an increase to counteract a perceived discrepancy

例句：

As what we have signed is a fix- price contract with escalation, the price can be changed without notice.由于我们所签的是一份标价伸缩合同，价格可以不经事先通知而变动。