By Casey Hall

SHANGHAI (Reuters) -U.S. and Chinese officials traded barbs at a celebration held by a U.S. business chamber in Shanghai on Friday, as the chamber appealed to both countries to provide more certainty to American businesses operating in China.

Scott Walker, consul general of U.S. consulate in Shanghai, told a gathering of U.S. businesses aimed at celebrating the 110th anniversary of the American Chamber of Commerce (AmCham) in Shanghai that the U.S.-China economic relationship had been unbalanced and non-reciprocal “for far too long.”

“We want an end to discriminatory actions and retaliation against U.S. companies in China,” he said.

In a speech that directly followed Walker’s, Chen Jing, a Shanghai Communist Party official who is also the president of the Shanghai People’

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