Aristotle uses the word “philia” for friendship, but he notes that there are three sorts of friendship. https://en.wikipedia.org/wiki/Aristotle#/media/File:Aristotle_Altemps_Inv8575.jpg The first is “friendship” of utility, It’s where you use someone to get something from them and they use us to get something. So, I can be “friends” with a car dealer. I get a car from him, he gets my money. The second is common interests. So I can be “friends” with people on my football team, my political party or my workmates. The third and highest form of friendship is that which fosters virtue. This is where two people live for the good of each other and make each other better people. So, in my most important friendship, my wife makes me a better employee, she encourages me to be better at sport and she makes me a better friend to other people. Aristotle provides a powerful set of criteria for evaluating “friendships.” *Is this person “friends” with me because they ...