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 Economic Costs of a Trade War
Major U.S. trading partners have already indicated they might retaliate to new U.S. trade tariffs recently announced by President Trump. New tariffs could, therefore, lead to a “trade war.” However, game theory also suggests that U.S. trading partners could eventually respond with “trade opening,” depending on the ultimate payoffs to each party in the trading partnerships.
We estimate that an all-out trade war would reduce GDP by 0.9 percent by 2027 and by 5.3 percent by 2040. Wages would decline by 1.1 percent by 2027 and 4.8 percent by 2040, relative to current policy. A trade opening would have the opposite effect: GDP would increase between 0.2 to 0.7 percent by 2027 and between 1.3 to 4.0 percent by 2040. Wages would increase between 0.3 to 0.8 percent by 2027 and between 1.2 - 3.6 percent by 2040, relative to current policy.
The downside risk of a trade war, therefore, is larger than the upside potential from a trade opening.

