In principle, landlords are interested in maintaining the original value of their rental incomes and to guard it against any devaluation through inflation. A suitable instrument for doing so is the stable value clause in rental contracts, which are aimed at giving monetary debts a lasting value. In doing so, it should be ensured that the creditor always receives the amount that corresponds to the value of the agreed sum of money at the time of the contract. Therefore, the rent is adapted to inflation. A clause of this kind must, however, be agreed to in the contract to be deemed applicable. Stable value clauses are normally related to the consumer price index (CPI), which is collected, calculated, and published monthly by Statistics Austria.