 Furthermore, preferences are subjective in that the evaluation is typically attributed to an agent – where this agent might be either an individual or a collective. This distinguishes them from statements to the effect that “\(X\) is better than \(Y\)” in an objective or otherwise impersonal sense. The logic of preference has often also been used to represent such objective evaluations (e.g. Broome 1991b), but the substantial notion of preference includes this subjective element. 