The first time I taught this module years ago, I wasn’t happy with the way I delivered this lecture, especially my treatment of the Social Contract Theory. So I wrote a series of blog posts to supplement the lecture. I’m somewhat happier with subsequent versions of this lecture, but since these posts were already written, I might as well make them available, with suitable updates. Note that the below will probably make more sense if you have already followed W06 and have the slides handy. Since there are three different versions of the theory to be considered, this post is going to be quite long.