Possibly a moral one but on the practical side I'd favour a progressive tax. seeing as the 'trickle-down' effect has been sort-of-disproven (unless one of you can bring good proof, which is what I'm hoping. I want to learn after all) and that rich people really can survive with higher taxes. I still want it to be profitable to be rich though, but that's obvious. I listen to a lot of rightists but I've never personally felt how a flat tax would be a better choice. Please, leftist and rightists: show thyne arguments.