Christopher Ketcham claims that Monopoly's origins start with a Maryland actress named Lizzie Magie, who created The Landlord's Game in 1906. It was designed "as a tool for teaching the philosophy of Henry George, a nineteenth-century writer who had popularized the notion that no single person could claim to 'own' land":
It also had Chance cards with quotes attributed to Thomas Jefferson (“The earth belongs in usufruct to the living”), John Ruskin (“It begins to be asked on many sides how the possessors of the land became possessed of it”), and Andrew Carnegie (“The greatest astonishment of my life was the discovery that the man who does the work is not the man who gets rich”). The game’s most expensive properties to buy, and those most remunerative to own, were New York City’s Broadway, Fifth Avenue, and Wall Street. In place of Monopoly’s “Go!” was a box marked “Labor Upon Mother Earth Produces Wages.”
The Landlord Game’s chief entertainment was the same as in Monopoly: competitors were to be saddled with debt and ultimately reduced to financial ruin, and only one person, the supermonopolist, would stand tall in the end. The players could, however, vote to do something not officially allowed in Monopoly: cooperate. Under this alternative rule set, they would pay land rent not to a property’s title holder but into a common pot—the rent effectively socialized so that, as Magie later wrote, “Prosperity is achieved.”
How it transformed into the game we know today:
The key to the mystery, he learned, was a radical socialist professor of economics named Scott Nearing, who taught at the Wharton School of Finance from 1906 to 1915. … The professor said he had learned to play the game around 1910, while living in Arden, then taught it to his students at Wharton in order that they might learn, in his words, “the antisocial nature of monopoly,” and in particular “the wickedness of land monopoly.” The students apparently taught it to their friends. It was around this time that the game became known as “monopoly”—denoted in lowercase, like checkers, chess, or dominoes. The game spread widely over the next several years, to the hometowns of Nearing’s students and to other universities. It would slowly lose its antimonopolistic message, however, as players came to the conclusion that Magie’s vision of Georgist redistribution was not nearly as entertaining as ruining one another.
(Image: Landlord's Game board, based on Elizabeth Magie Phillip's 1924 patent by Lucius Kwok from Wikimedia Commons)