Case Study: Singapore to liberalise postal sector from april 1, 2007. Singapore will open up its postal sector to news players from April, ending SingPost's monopoly of the basic mail services market after some 15 years. The government says the price discrimination competition will sustain the monopoly power, will create jobs, generate cost savings and improve service quality. Elaborate why monopolist (Singapore Postal Service) choose of price discrimination to sustain the monopoly power on their business strategies