或有租金
contingent rent
這是不固定的金額，但是是基於比用的時間（未來銷售的如百分比，未來使用量，未來的價格指數，未來市場利率的推移發生變化等因素的未來量租賃支付的那部分 出於興
That portion of the lease payments that is not fixed in amount but is based on the future amount of a factor that changes other than with the passage of time (eg percentage of future sales, amount of future use, future price indices, future market rates of interest).