Hong Kong’s bar owners are calling for a cut in the tax on hard liquor to save the industry amid a slump in business as residents head to mainland China for cheaper nights out. Seventy per cent reported that revenue had fallen by 20 to 30 per cent compared to the pre-pandemic period, with the remainder reporting an even larger decline, according to a survey conducted by the Hong Kong Bar & Club Association. Releasing the survey results on Wednesday, the association said the slowdown in business resulted from Hongkongers heading to mainland China during holidays and the migration wave among wea…