Let me hammer this point again: the failure of any of Barro, Bhagwati, Boskin, Calomiris, Cogan, Holtz-Eakin, Hubbard, Lazear, Lindsey, Mankiw, Rosen, Shultz, Taylor, and a hundred-odd others to write about—or even express curiosity about why—their confident predictions of a year ago that the Trump-McConnell-Ryan corporate tax cut would generate a huge investment boom—that silence speaks very loudly about the genre in which they viewed their forecasts back at the time:
A year ago there were a substantial number of economists who were assuring us that the Trump-McConnell-Ryan corporate tax cut was not just a giveaway to rich stockholders but would provide a sustained and substantial boost to investment in America that would boost productivity by:
Barro, Boskin, Cogan, Holtz-Eakin, Hubbard, Lindsey, Rosen, Shultz, and Taylor said "3% to 4%... if achieved over a decade, the... increase in... annual... growth would be about 0.4%..."
Hubbard, Lindsay, Holtz-Eakin, and a fourth (who is either Lazear or Mankiw) said, according to Sen Susan Collins (R-ME), by enough to raise tax collections enough to keep the deficit from going up by much.
Miller, Calomiris, Bhagwati, and a hundred-odd others said by enough to raise tax collections enough to keep the deficit from going up at all—and boost annual growth by 0.4%.
And Kevin Hassett and Greg Mankiw told us that these productivity gains would primarily boost wages not profits—because the relevant model was not one in which the tax cut raised after tax profit and interest rates but rather one in which foreigners would flood America with savings, lending to and investing in this country on a large scale to finance the bulk of this surge and investment.