Want to Play a Game? Global Trade War Is the New Washington Pastime.

The world’s biggest powers were deep in a trade war. Economic losses from the tariffs that President Trump had imposed on most of the world, along with global retaliation, were accumulating. Jobs were being lost, inflation was ticking up and the world was both frustrated with and anxious about the United States.

While the stakes were real, the trade war was not. Instead, it was a simulation to better understand how a global trade fight might unfold.

Last month, two dozen trade experts from the United States and other countries gathered at a Washington think tank to try to simulate what could happen if Mr. Trump moves ahead with his plan to impose punishing tariffs on America’s biggest trading partners.

Teams representing China, Europe, the United States and other governments spent a day running between conference rooms, offering proposals to remove the tariffs and make trade deals to forestall economic collapse.

The game, which took place at the Center for a New American Security, a bipartisan think tank focused on security issues, included think tank experts and former officials in the Trump and Biden administrations. The exercise was not aimed at predicting the future. Instead, by acting out what might happen, the participants were trying to reveal some of the dynamics that might be at play as Mr. Trump pursues an aggressive trade approach against allies and adversaries alike.

In the last two months, Mr. Trump imposed tariffs on China, Canada and Mexico, as well as levies on global steel and aluminum imports. On Wednesday, Mr. Trump is expected to announce a plan to raise tariff rates on other countries, and his 25 percent tariffs on cars and auto parts will go into effect on Thursday.