Chemical Leasing is based on the principle of increasing the efficiency of processes using chemicals by utilising the specific knowledge of the supplier (and/or the producer) and sharing the savings between supplier and user of the chemical. The following cost — benefit analysis presents a simplified model, just taking the business relations of two partners and one product into account. Therefore the effects of Chemical Leasing to the plant(s) of the producer, the supply chain and other macro-economic effects are not included.