But the new consensus rate of 2.6%, for a recovery now two years old, is barely above America's long-term potential and scarcely enough to bring unemployment down.

One thing on which there does seem to be a consensus is that America's marginal rate of corporate income tax-at 35%, one of the world's highest-must come down.

There is a consensus among all the candidates that the federal corporate tax rate of 35%, the highest in the rich world, must be slashed.