This expository note offers two diagrams that may be helpful when introducing students to social choice theory. The first diagram may help students get a feel for preferences and the Kemeny distance between preferences. This diagram is then used to discuss intransitivities arising from aggregating the preferences of two individuals. It is argued that this provides a better introduction to Arrow’s theorem than the common use of Condorcet cycles. An alternative diagram that can be used for the same purpose or for further exercises is also offered.
