 The above properties are mainly found in the social choice literature. A related property in the economic literature is the so-called Weak Axiom of Revealed Preferences (WARP). It says that if \(X\) is chosen when \(Y\) is available, then there must not be an alternative set \(\mathcal{B}\) containing both alternatives for which \(Y\) is chosen and \(X\) is not. 