Disputation VIII: On Exchange

CAMBIRE means the same as to change; yet not every change of some thing is called Cambium; as if you were to change a horse for clothes, you would not be said to cambire except broadly: But this contract is most usual among Merchants, and Changers, inhabitants of different cities; and is most apt for carrying money hence and thence: yet its bond binds principally the Campsor and Campsarius, of whom below. It differs indeed from sale, because the latter claims money for a thing of another species; it differs also from a loan, because that is made in things of diverse nature, as in wheat, wine, and the like; but Cambium demands money for money, as will appear from its definition below.