Editing Quid pro quo (section)

=== Common law ===
In [[common law]], ''quid pro quo'' indicates that an item or a service has been traded in return for something of value, usually when the propriety or equity of the transaction is in question. A [[contract]] must involve [[consideration]]: that is, the exchange of something of value for something else of value. For example, when buying an item of clothing or a gallon of milk, a pre-determined amount of money is exchanged for the product the customer is purchasing; therefore, they have received something but have given up something of equal value in return.