I just want to point out that the type of equipment used for keeping chickens can make a huge difference to their quality of life.
We studied caged hens in my biology class and I couldn't believe that humans would treat a living being like that. Shut in a tiny confined space, standing on wire, without anything to do except pull out its own feathers. The caged hen is basically being tortured so that people can have cheap eggs.
And all it takes is for the hen to be kept in a barn. I don't even insist on people having free range eggs. In a humane barn setting, you get almost as many eggs, but the chickens can move around, roost, scratch in the sand and basically keep themselves sane.
Yes, it's a bit more expensive. But if people are going to insist on a free market they need to learn to speak with their money and buying humane eggs says "I don't believe in torturing animals."