It’s been a long time since my college econ classes, but I remember the flaw with Laffer’s curve wasn’t so much that it exists as it was his assumption that we’re on the right side of the curve instead of the left.

As far as I can remember, even if Laffer was correct about his theory (and that’s a hell of an if) no one has been able to demonstrably prove the point where cutting taxes increases federal revenue. It’s pretty obvious at this point the whole theory is just a post hoc rationale for cutting taxes.