A CNNMoney story, “Trade War Would Wipe Out Gains From Tax Cuts, Penn Analysis Says,” applies two Penn Wharton Budget Model (PWBM) studies on trade and tax cuts. Patrick Gillespie points out that two of President Trump’s policies could have opposing effects on economic growth. If the new tariffs announced by President Trump lead to an all-out trade war, gains from the tax cuts could be washed away in the short run and swamped in the long run.

The red bars in Figure 1 show that by 2027, the tax cuts lead to an economy that is 1.1 percent larger than under the old tax system. However, an all-out trade war, a worst case scenario where the U.S. is completely closed to trade, would have the opposite effect. So, in 2027, the combined effect of the tax cuts and an all-out trade war is an economic wash. By 2040, the net effect of the tax cuts and an all-out trade war is an economy that is 3.7 percent smaller than otherwise.