Commutative contract

COMMUTATIVE CONTRACT, civil law. One in which each of the contracting parties gives and, receives an equivalent. The contract of sale is of this kind. The seller gives the thing sold, and receives the price, which is the equivalent. The buyer gives the price and receives the thing sold, which is the equivalent.
     2. These contracts are usually distributed into four classes, namely; Do ut des; Facio ut facias; Facio ut des; Do ut facias. Poth. Obl. n. 13. See' Civ. Code of Lo. art. 1761.