It's amazing that people still get away with saying obviously wrong, and repeatedly debunked, junk economics like this, but here we are.
Illinois congressman Joe Walsh made a comment on This Week with Christiane Amanpour, saying that "Every time we've cut taxes, revenues have gone up, the economy has grown." Politifact decided to take a look at that, and found it to be sorely lacking.
Here is the main thrust of what this bit of voodoo math gets wrong (bold mine):
...economists expect tax revenues to go up each year due to economic growth, population growth and inflation, even if tax rates stay the same. So saying "revenues have gone up" isn’t particularly meaningful in that context.
Given that, it would be more significant to be able to say what effect tax changes have on the overall economy. But this isn’t easy, because so many things affect the economy more than the federal tax code. What this means is that you can raise taxes during a b...