There's no objective, fair way to answer that question. This is something that can only be answered by a societal discussion and hopefully some democratic way o

There's no objective, fair way to answer that question. This is something that can only be answered by a societal discussion and hopefully some democratic way of decision. I'm not sure this is what you're trying to do, but it sounds a bit you want to imply that because there's no objective measurements of "fairness" we shouldn't even try. FWIW I think your question doesn't give me enough information to form an opionion, because the tax should depend on needs of the authority that does the taxing (e.g. if there's an obvious lack of healthcare in a country that causes many people to die needlessly - that'd be a good reason for higher taxes).