Live from Souvenir on Claremont: (Early) Monday Smackdown: Tax Reform Intellectual Garbage Cleanup Edition:
1) I am informed—by "persons who say they are familiar with the matter"—that Barro, Boskin, Cogan, Holtz-Eakin, Hubbard, Lindsey, Rosen, Shultz, and Taylor are not lying when they say on Wednesday "we did not offer claims about the speed of adjustment to a long-run result...." even though the previous Saturday they had written about a raise in "the level of GDP in the long run by just over 4%. If achieved over a decade, the associated increase in the annual rate of GDP growth would be about 0.4% per year..."
Why aren't they lying on Wednesday?
Because the "if" does not mean: "it could be the case that..."
Instead, the "if" means: "for illustrative purposes, if you have trouble converting from changes in levels to growth rates, as an illustrative example, suppose that in a counterfactual world (which is definitely not this world)..."