To illustrate, pick some person \(d\), any one at all, and from each profile \(\langle R_{i}\rangle\) in the domain take the ordering \(R_{d}\) representing the preferences of \(d\). Now, in each case, let the social preference be that. In other words, for each profile \(\langle R_{i}\rangle\), let \(f\langle R_{i}\rangle\) be \(R_{d}\).  This social welfare function \(f\) bases the social ordering entirely on the preferences of \(d\), its dictator. It is intuitively undemocratic and D rules it out.