In addition to confronting gender politics, Magie decided to take on the capitalist system of property ownership – this time not through a publicity stunt but in the form of a board game. The inspiration began with a book that her father, the anti-monopolist politician James Magie, had handed to her. In the pages of Henry George’s classic, Progress and Poverty (1879), she encountered his conviction that ‘the equal right of all men to use the land is as clear as their equal right to breathe the air – it is a right proclaimed by the fact of their existence’.

Travelling around America in the 1870s, George had witnessed persistent destitution amid growing wealth, and he believed it was largely the inequity of land ownership that bound these two forces – poverty and progress – together. So instead of following Twain by encouraging his fellow citizens to buy land, he called on the state to tax it. On what grounds? Because much of land’s value comes not from what is built on the plot but from nature’s gift of water or minerals that might lie beneath its surface, or from the communally created value of its surroundings: nearby roads and railways; a thriving economy, a safe neighbourhood; good local schools and hospitals. And he argued that the tax receipts should be invested on behalf of all.

Determined to prove the merit of George’s proposal, Magie invented and in 1904 patented what she called the Landlord’s Game. Laid out on the board as a circuit (which was a novelty at the time), it was populated with streets and landmarks for sale. The key innovation of her game, however, lay in the two sets of rules that she wrote for playing it.

Under the ‘Prosperity’ set of rules, every player gained each time someone acquired a new property (designed to reflect George’s policy of taxing the value of land), and the game was won (by all!) when the player who had started out with the least money had doubled it. Under the ‘Monopolist’ set of rules, in contrast, players got ahead by acquiring properties and collecting rent from all those who were unfortunate enough to land there – and whoever managed to bankrupt the rest emerged as the sole winner (sound a little familiar?)