Europe’s leading business lobby in China has called for a unified “one Shanghai” policy, urging authorities to offer citywide economic support, rather than isolating benefits in remote districts, as operational hurdles mount.“We do believe that Shanghai should have a ‘one Shanghai’ policy,” said Carlo Diego D’Andrea, vice-president of the European Chamber of Commerce in China and chairman of its Shanghai board, on Thursday.D’Andrea said incentives should not be concentrated in outlying...