What legal principle is expressed as 'something for something'?

The legal principle expressed as 'something for something' is known as quid pro quo. This Latin phrase refers to a mutual exchange where one thing is given in return for another. In legal contexts, it is often used to describe circumstances where a favor or advantage is provided in return for a corresponding return, such as in contract law or in discussions about employment relationships and agreements.

Understanding quid pro quo is fundamental in various areas of law, particularly in contract formation, where both parties must provide something of value to establish a valid agreement. The emphasis on mutual benefit highlights the importance of reciprocity in legal exchanges. This principle is crucial in ensuring that agreements are equitable and enforceable, as each party has contributed something of value to the arrangement.