GM to write down value of China business by more than $5bn

General Motors told shareholders on Wednesday that it would write down the value of its China business by more than $5bn.The company’s board of directors determined that the non-cash charges were necessary “in light of the finalization of a new business forecast and certain restructuring actions” with the joint venture, according to a company filing.CEO Mary Barra has been transforming GM’s operations in China as the former profit engine slipped to a loss in the last year. Barra told investors in October th ...