Two very different tax stories this week. In America, @realDonaldTrump is cutting taxes, the oft-mooted theory being that putting more money into the economy makes everyone, not just the rich, richer and more, not less tax is paid in the end. In Scotland, @NicolaSturgeon (who doesn’t have quite as many Twitter followers) is on the well-trodden ‘those with the broadest shoulders should pay more’ path. Which will work? Will either be in power long enough for us to find out?