An implied contract is one that is inferred from the actions of the parties. When parties have not discussed terms, an implied contract exists if it is clear from the conduct of both parties that they intended there be one. A delicatessen patron who asks for a turkey sandwich to go has made a contract and is obligated to pay when the sandwich is made. By ordering the food, the patron is implicitly agreeing to the price, whether posted or not.
The distinction between express and implied contracts has received a degree of notoriety in the so-called palimony cases, in which one member of an unmarried couple seeks a division of property after a long-standing live-together relationship has broken up. When a married couple divorces, their legal marriage contract is dissolved, and financial rights and obligations are spelled out in a huge body of domestic relations statutes and judicial decisions. No such laws exist for unmarried couples. However, about one-third of the states recognize common-law marriage, under which two people are deemed to be married if they live together with the intent to be married, regardless of their failure to have obtained a license or gone through a ceremony. Although there is no actual contract of marriage (no license), their behavior implies that the parties intended to be treated as if they were married.