My guess is that Art Laffer knows better, but is disingenuously making a partisan argument for propaganda purposes — modern priest-speak to fool the rubes in the pews and get them to vote against their interests.
Read it at Brad DeLong — Grasping Reality with Both Invisible Hands
Why History Of Economic Thought Is Important: Whack-A-Mole Wall Street Journal/Arthur Laffer Edition
David Glasser, FTC economist, shreds Laffer, too, in Arthur Laffer, Anti-Enlightenment Economist. Check you the exchange in the comments between Glasser and Lars Christensen, who also slammed Laffer today ( link at end of Glasser post).
Noah Smith @Noahpinion tweets, Should I bother pulpifying Art Laffer when others have done it so well already? Probably not. Sigh...