Today we have a guest post from Joseph W. Roberts, associate professor in the Department of Politics and International Relations at Roger Williams University. He can be contacted at jroberts [at] rwu [dot] edu.
Recently someone on Twitter asked about teaching coalition governments and their formation in an introduction to comparative politics class. I responded to the query with an exercise that I use to demonstrate presidential vs. parliamentary systems and voting systems. The exercise demonstrates why a state might choose one system over another in a way the mirrors the perspective championed by Lijphart (references listed below).
I begin by talking to the students about the size principle and the minimum winning coalition described by Riker and the critiques about whether a minimum winning coalition of two parties with a “margin” of one is actually stable (see Shepsle, Butterworth, or Brown). I explain ways in which party identity/ideology can affect the creation of coalitions, and ask students to think of other factors, such as ethnic identity, that might be part of the process. This subject is usually covered briefly in comparative politics textbooks and I just reinforce some of the basic concepts.
I then use the actual party data from an election available from Wikipedia—usually Israel because it has a lot of elections—but any election where a coalition government is formed will work. I give the students the list of parties that received seats in the election, a rough description of each party’s ideology, and a number line showing where each party fits in the left-right political spectrum, as shown in the table below.Continue reading “Coalition Governments”