You're talking now of an effective marginal rate > 100%, which is not what you said originally ("If you want less of something, tax it. If you want more of some

You're talking now of an effective marginal rate > 100%, which is not what you said originally ("If you want less of something, tax it. If you want more of something, subsidize it."). I agree marginal rates should always be < 100% for the obvious reasons. I haven't seen numbers that it ever happens, but it is to be avoided in theory, yes.