Magie filed a legal claim for her Landlord’s Game in 1903, more than three decades before Parker Brothers began manufacturing Monopoly. She actually designed the game as a protest against the big monopolists of her time — people like Andrew Carnegie and John D. Rockefeller.

She created two sets of rules for her game: an anti-monopolist set in which all were rewarded when wealth was created, and a monopolist set in which the goal was to create monopolies and crush opponents. Her dualistic approach was a teaching tool meant to demonstrate that the first set of rules was morally superior.

Source: Monopoly’s Inventor: The Progressive Who Didn’t Pass ‘Go’ – The New York Times