According to the IMF, “The U.S. tax changes are ‘expected to be responsible for about half of the upward revision to global economic growth over the next two years.’ The U.S. is expected to grow about 2.7% in 2018, up from an estimate of 2.3% in the previous round of forecasts. The forecast for 2019 now calls for 2.5% growth, up from 1.9%. By 2020, the cumulative effects of the changes will make the U.S. economy about 1.2% larger than it would have been without tax reform.” https://www.wsj.com/articles/u-s-tax-overhaul-will-accelerate-global-growth-imf-says-1516629601