Monopoly...

Is it wrong that only one company makes the game MONOPOLY?

[Monopoly was released on this date in 1935 by Parker Brothers.
It was 1934, the height of the Great Depression, when Charles B. Darrow of Germantown, Pennsylvania, showed what he called the MONOPOLY game to the executives at Parker Brothers. Initially, they rejected the game due to "52 design errors". More than five billion little green houses have been "built" since 1935.]
http://www.hasbro.com/games/kid-games/monopoly/