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Claim: “Motor vehicle manufacturing is one of the most heavily regulated industries in the country and even in the world. The U.S. economy today is 25 percent smaller than it would have been without the surge of regulations since 1980. It is estimated that current overregulation is costing our economy as much as $2 trillion a year.”

Fact Check: The auto industry is indeed heavily regulated, and regulations cost money. Federal rules, however, also have important benefits. Over the past half-century, fatality rates in automobile accidents have been halved and then halved again. In 2014, there were just 1.08 deaths for every 100 million miles that Americans traveled.

It is inherently difficult to estimate economic growth in a world that never was. Mr. Trump’s assertion is based on research published by the Mercatus Center at George Mason University, which takes a dim view of regulation. Other economists regard its estimates as considerably overstated.

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Claim: “President Obama, and the usual so-called experts who’ve been wrong about every trade deal for decades, predicted that the trade deal with South Korea would increase our exports to South Korea by more than $10 billion — resulting in some 70,000 jobs.

Like Hillary Clinton’s broken promises to New York, these pledges all turned out to be false. Instead of creating 70,000 jobs, it has killed nearly 100,000 jobs, according to the Economic Policy Institute. Our exports to South Korea haven’t increased at all, but their imports to us have surged.”

Fact Check: The early results of the free trade agreement between the United States and South Korea, which took effect in 2012, have fallen short of the administration’s predictions. South Korea bought $43.5 billion in American exports in 2011; last year, exports totaled $43.4 billion. And Korean imports have increased.

Circumstances have played a role. The strength of the dollar has weighed on global demand for American goods, while increasing American demand for foreign goods. Also, the agreement called for some import barriers to be reduced gradually.