Well, Llywydd, can I thank the Member for his questions this afternoon? When we published our shortlist of potential taxes under the Wales Act 2014, it was exactly in order to generate a debate about the way in which these potential new powers for Wales could be used for important purposes that matter to people in Wales in the future. Some of the issues that the Member has raised this afternoon I think help to create that sort of debate and have done so in an area, which we all know, given the age structure of our population and what that means for public services in the future, is a debate that is unavoidable if we're to prepare properly for that future.