You can consider as many dimensions as you want. As I mentioned, for some time we had three papers regularly delivered, for additional perspective. However typ

You can consider as many dimensions as you want. As I mentioned, for some time we had three papers regularly delivered, for additional perspective. However typically, a single dimension is a useful first-order approximation[1], and so that's what's done in politics as well. As with all approximations, sometimes it works well and other times it does not. [1]: https://en.wikipedia.org/wiki/Order_of_approximation https://en.wikipedia.org/wiki/Order_of_approximation