Never have so many simulations been ignored in favor of faith in tax cuts. Here's the CRFB's run down on growth impacts from the tax legislation as passed.

Source: CRFB's run down.

Hence “the final bill [increases] average GDP growth by just 0.01 to 0.02 percentage points per year over a decade.”

I am glad to see that the unicorns and tooth fairies folks have not taken over the JCT (yet). (Here is one example of the “unicorn and fairy dust” crowd, who makes a reference to a mysterious organization called the “JTC”).