Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass) and entrepreneur Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE's fight over jobs and automation at the last Democratic debate highlighted the divide over the contentious issue, including among experts.

Warren and Yang sparred at Tuesday's presidential debate over whether automation or trade were primarily responsible for eliminating jobs in key parts of the country.

Yang’s campaign is centered around a universal basic income, which would pay every adult citizen $1,000 a month to combat the job loss brought on by automation. Americans, he said, are already seeing the effects of speedy technological advancement.

“Their Main Street stores are closing. They see a self-serve kiosk in every McDonalds, every grocery store, every CVS," he said at the debate in Ohio. "Driving a truck is the most common job in 29 states, including this one; 3.5 million truck drivers in this country. And my friends in California are piloting self-driving trucks."

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While some of Warren’s plans acknowledge the role of automation, she has dismissed it as the primary driver of job loss.

“The data show that we’ve had a lot of problems with losing jobs, but the principal reason has been bad trade policy. The principal reason has been a bunch of corporations, giant multinational corporations who’ve been calling the shots on trade,” she said at the debate.

Warren argues that empowering workers on both corporate boards and in trade negotiations would help alleviate those problems.

Following the debate, The Associated Press issued a fact check siding with Yang, pointing to one study from Ball State University in 2015 that attributed some 88 percent of manufacturing job losses to automation.

“Economists mostly blame those job losses on automation and robots, not trade deals. So the Massachusetts senator is off,” the AP Fact Check wrote.

While members of the “Yang Gang,” Yang’s devoted online supporters, expressed glee at the report, labor economists and experts took issue with the AP ruling, issuing their own fact checks on the news wire.

“That fact check strikes me as incorrect,” said Melissa S. Kearney, a University of Maryland economist who along with Katharine G. Abraham co-authored a comprehensive review of factors behind employment loss.

The paper, published last year with the National Bureau of Economic Research, found that two of the top factors affecting job loss were “increased import competition from China and the penetration of robots into the labor market,” but found competition from China had more than double the effect of automation.

Noah Smith, a Bloomberg Opinion columnist, argued that the Ball State study cited by AP was “of much lower quality than research showing a big impact from China.”

“AP Fact Check got this one wrong,” he tweeted.

In a statement to The Hill, the AP said it stood by its story.

Nobel Laureate Paul Krugman assailed both Yang’s position and the AP fact check in a New York Times column, pleading with Democrats not to “go down the robot rabbit hole.”

“As it happens, Warren was more right than the supposed fact-checkers,” he wrote. “As far as I can tell, [Yang is] offering an inadequate solution to an imaginary problem, which is in a way kind of impressive,” he added.

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Krugman argued that the effect of technological change on jobs is no different today than it has been at any other time in modern history, noting that similar anxieties existed about machines taking away farmers’ jobs. While technology did cause the share of the jobs devoted to agriculture to drop precipitously in the last 80 years, he noted, better, higher-level jobs replaced them.

In response to criticism from Krugman on the same issue in June, Yang pointed to the low level of labor force participation.

Former Maryland Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE, a 2020 Democratic candidate who did not qualify for the most recent debate, rejected Yang's position, noting that automation had its upsides.

“Krugman is right, the idea that automation will take away all the jobs is a complete fantasy. Innovation always displaces AND creates jobs, that's how progress works. What we need is massive public investment in workers and infrastructure to manage change,” he tweeted.

But while the experts seemed to side more closely with Warren, they didn’t let her off the hook completely either.

The primary culprit in trade-related job loss, they said, was China, which upended the global economic order when it began to open up its economy and joined the World Trade Organization in the 2001.

“I want to be clear that it’s not to say that trade writ large is bad, but the experience of the last 20 years, with China in particular, has led to employment loss,” said Kearney.

Recent studies, she noted, have shown that the shock of China’s economic boom and integration into the global economy has begun to recede.

Ernie Tedeschi, a managing director and policy economist for Evercore ISI, argues that although the U.S. lost some jobs to Mexico following the North American Free Trade Agreement, the deal actually helped prevent deeper job losses by giving U.S.-based companies a reason to stay put instead of relocating entirely to China.

While there is still a robust academic debate, he said, research seems to indicate that automation has had more of an effect on wages than on the number of jobs.

“Automation has probably allowed output and profits of firms to grow faster than pay has,” he said.

The debate shows no signs of cooling off.

Zach Moller, deputy director of the economic program at Third Way, a think tank argued that policy-makers should instead focus on how to help workers, regardless of what’s behind it, floating a new look at unemployment compensation and skills training.

“If you ask the worker who lost their job, I don't think they care whether they lost the job from a robot or outsourcing,” he said. "They care how they will support their family."