U.S. President-elect Donald Trump has vowed to conduct “the largest deportation effort in American history,” no matter the price tag—but the economic costs of such a campaign may be bigger than he has bargained for.

Trump soared to victory in the recent presidential election after campaigning on a hard-line immigration policy and promising to oversee mass deportations, pledging at one point to target between 15 million and 20 million undocumented immigrants. Vice President-elect J.D. Vance has said that the administration would “start with 1 million,” beginning with “the most violent criminals.”

U.S. President-elect Donald Trump has vowed to conduct “the largest deportation effort in American history,” no matter the price tag—but the economic costs of such a campaign may be bigger than he has bargained for.

Trump soared to victory in the recent presidential election after campaigning on a hard-line immigration policy and promising to oversee mass deportations, pledging at one point to target between 15 million and 20 million undocumented immigrants. Vice President-elect J.D. Vance has said that the administration would “start with 1 million,” beginning with “the most violent criminals.”

When the former U.S. leader returns to office in January, those plans are certain to face logistic, legal, political, and financial obstacles—all of which have raised questions about what Trump can actually do, and how quickly. But if Trump does succeed in conducting deportations close to the scale that he has promised, economists expect the effort to deal a blow to the U.S. economy, driving up inflation and undercutting economic growth.

“Leaving aside the human issues, leaving aside the law issues, we think that would be very destructive economically,” said Adam Posen, the president of the Peterson Institute for International Economics. “I don’t think people have really understood how potentially big that effect is.”

Around 11 million people are estimated to be in the United States illegally, according to the Department of Homeland Security, a population that accounts for nearly 5 percent of the total U.S. workforce and comprises particularly large shares of the labor force in agriculture, construction, and leisure and hospitality.

As of 2017, an estimated 66 percent of undocumented immigrants had lived in the United........

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