The last time a U.S. Treasury secretary visited China, Washington and Beijing were locked in a trade war, the Trump administration was preparing to label China a currency manipulator, and fraying relations between the two countries were roiling global markets.Four years later, as Treasury Secretary Janet L. Yellen prepares to arrive in Beijing, many of the economic policy concerns that have been festering between the United States and China remain — or have even intensified — despite the Biden administration’s less antagonistic tone.The tariffs that President Donald J. Trump imposed on Chinese goods are still in effect. President Biden has been working to restrict China’s access to critical technology such as semiconductors. And new restrictions curbing American investment in China are looming.Treasury Department officials have downplayed expectations for major breakthrough …
