Zombie ideas are false ideas about how the economy works that just won’t die, despite evidence proving them wrong. These policy ideas shamble relentlessly forward essentially because they suit a political agenda. According to Paul Krugman, they won’t die because politicians won’t let them. The controversy over the withdrawal by the Congressional Research Service of a report showing no connection between tax cuts for the rich and economic growth is a reminder that in U.S. politics, at least, the tax cuts/growth notion is the ultimate zombie idea.