Most acceptance agreements contain force majeure clauses. These clauses allow the buyer or seller to terminate the contract in the event of the occurrence of certain events that are beyond the control of one of the parties and when one of the other parties imposes unnecessary difficulties. Force majeure clauses often offer protection against the negative effects of certain natural acts such as floods or forest fires. A purchase agreement is an agreement between a producer and a buyer to buy or sell some of the producer`s future products. A purchase contract is normally negotiated before the construction of a production plant – such as a mine or plant – to secure a market for future production. agreement = agreement) means a purchase contract of a particular type.