Thanks for the links (and your post!), I now have a much clearer idea of the depths of my ignorance on this topic.
I want to believe that there is some optimal general prior, but it seems much more likely that we do not live in so convenient a world.
I want to believe that there is some optimal general prior, but it seems much more likely that we do not live in so convenient a world.
But if you can evaluate how good a prior is, then there has to be an optimal one (or several). You have to have something as your prior, and so whichever one is the best out of those you can choose is the one you should have. As for how certain you are that it's the best, it's (to some extent) turtles all the way down.
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