And that's just lost revenue—never mind the cost of actually implementing such a plan.

By Nikki Ekstein
December 08, 2015
Trump Muslim Travel Ban
Credit: Getty Images

Yesterday, Donald Trump called for a total ban on Muslim travelers to the U.S. But perhaps the billionaire—who partially makes his keep off the travel industry—hasn’t considered the economic impact of his proposed policy. Banning Muslim travel isn’t just a betrayal of American ideals, it’s also a costly proposition. Currently, there’s no way to track tourists by their religion, but here’s a back-of-the-envelope look at what it would really mean to cut Muslim travel from the U.S. economy.

According to a 2012 study cited in the business publication Economy Watch, the six countries of Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the UAE represent a majority of the Middle East’s travel spending, and account for 37 percent of all Muslim travelers worldwide. With that in mind, we looked at the spending habits of Middle Eastern travelers to the U.S. as a way to gauge the impact of Muslim travel at large.

In 2013, just over one million Middle East-based travelers passed through U.S. customs, according to the U.S. Travel Association. That year, these travelers spent an average of $6,000 each for a total of $6.8 billion. (European visitors, by contrast, spend less than $4,000 on average when they visit the U.S.)

Of course, the Middle East also includes the mostly non-Muslim country of Israel. However, Israel’s 8 million residents make up a mere 0.1 percent of the total population in the Middle East; it’s a negligible contributor to the region’s $6.8 billion sum.

Still, travelers from the Middle East represent just over 37 percent of Muslim travelers overall; the region excludes Turkey, Indonesia, and Malaysia, among others, which are also predominantly Muslim.

Multiply this $6.8 billion figure to represent the full scope of Muslim travelers arriving in the U.S., and the total cost of Donald Trump’s ban could be as high as $18.4 billion. What's more, that figure is the cost estimate before you factor in what it would cost to overhaul the country’s screening systems.

*All facts and figures represent the most current data available, and are sourced from the U.S. Travel Association, unless otherwise noted.