But neither side appears to have budged, and economists say three months is too little time to resolve issues that have disrupted U.S.
Tesla broke ground this week in Shanghai on its first factory outside the U.S. Musk said production of its Model 3 would start late this year.
The discussions "went just fine", he said without elaborating, the Hong Kong-based South China Morning Post reported.
"It certainly has hurt the Chinese economy", Ross told CNBC, noting that China exports many more goods to the United States than the other way around.
The U.S. trade delegation in Beijing is "wrapping up" meetings with Chinese officials and will return to the United States after a 'good few days, ' a U.S. official said.More news: Arsenal favourites to sign Yannick Carrasco from Dalian Yifang
But they extended past their deadline, which the Chinese Foreign Ministry said signified that both sides were "very serious about these negotiations".
A member of the United States delegation said the two sides would resume talks on Wednesday as they continue their first face-to-face meetings since Trump and Chinese President Xi Jinping agreed to a tariff truce during a meeting in Argentina on December 1.
Washington wants Beijing to change plans for government-led creation of Chinese leaders in robotics and other advanced technologies.
Asked if that meant the talks had been hard, Lu said: "I can only say that extending the consultations shows that the two sides were indeed very serious in conducting the consultations". "Neither side has made a briefing, because the US delegation is on the plane now", wrote Hu Xijin, editor of the Global Times, published by the ruling Communist Party's official People's Daily.
The editor-in-chief of the Global Times, a state-run Chinese newspaper known for its nationalist leanings, said on Twitter around 4 pm in Beijing that he'd heard the two sides were still consulting on the wording of coordinated statements.More news: New 2019 BMW 7 Series images showing X7 influence leak
The Trump administration wrapped up the latest round of trade talks in Beijing, noting a commitment by China to buy more US agricultural goods, energy and manufactured items.
The U.S. president is increasingly eager to strike a deal with China soon in an effort to perk up financial markets that have slumped on concerns over the trade war, according to people familiar with internal White House deliberations.
The American delegation is led by a deputy US trade representative, Jeffrey Gerrish, and includes agriculture, energy, commerce, treasury and State Department officials. Liu made a brief appearance at the talks in Beijing on Monday, boosting optimism that China was serious about making progress on a deal.
The paper said in an editorial that Beijing's stance remained firm that the dispute harms both countries and disrupts the global trade order and supply chains.More news: Golden Globes 2019: A multitude of surprise winners
A combination of lower shipping costs and lower domestic demand will boost USA crude oil exports to Asia, Reuters reports, citing sources from the commodity trading and shipping industries.
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