Top executives in Hong Kong have warned they will have "no reason to stay" if the city's freedoms are damaged by a proposed bill allowing extradition to mainland China.In a trend that could be damning for the international finance hub, some businesses say they would consider moving if the controversial bill – which has provoked a huge backlash in the city – is passed. "Hong Kong is a jewel," the French boss of an investment company said on the condition of an