THE COMPANY that makes the legendary Monopoly board game is being investigated by the Office of Fair Trading over alleged price fixing. US-owned Hasbro is Britain's biggest toy group with between 14% and 18% of the £1.7bn-a-year market, making, licensing or distributing games and toys such as Action Man, Scrabble, Trivial Pursuit and My Little Pony, as well as Monopoly. It also has deals to make and distribute Harry Potter merchandise.