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An OECD review concluded that administrative difficulties, modest revenues, and failure to adequately address wealth inequality were main reasons why all but four nations have since abandoned the tax, the Wharton researchers said.

An internet user identified as “zhongjusaodi” first found that Marriot International listed the four regions as independent nations when selecting his location on the app of the hotel.

An International Coffee Organization report released last year said Chinese coffee imports grew by 16 percent year-on-year in 2017, compared with about 2 percent in the United States, the world's largest coffee consumer.

An air purifier tower, Mukherjee said, filters PM 10 and PM 2.5 particles from the atmosphere. "And the air inside the tower is heated using solar energy, and the hot filtered air is released from the top," he said.

An expert on China's economy, Prasad said he has seen positive signs in the country's economic transition and reforms in recent years.