Even if Microsoft keeps its promise to keep the game on PlayStation, Ryan believes there will be " some form of degraded experience for PlayStation gamers." Microsoft has accused the FTC of ignoring the pressure on the company's gaming division to deliver profit margins that justify the huge price paid for Activision, as well as the fierce backlash likely from highly opinionated video game fans if a popular franchise such as Call of Duty is not made available on other platforms. According to Harvard University economist Robin Lee, a hired expert brought in by the FTC, such backlash would likely be offset by the " pretty substantial economic benefits" Microsoft could gain by denying rivals access to Call of Duty and other popular games, such as allowing Xbox users to get earlier or better versions of the game.