The Rulebook Diff Engine
Track additions, subtractions, and mathematical revisions across historical ruleset editions. Understand how modifying a single cost or action window reshapes the entire strategic incentive matrix.
Elizabeth Magie's Single Tax vs Parker Bros vs Casual House Rules
Elizabeth Magie patented The Landlord's Game with two rule sets: Monopolist (where one player crushes everyone) and Single Tax (where land rent flows into a public treasury, creating schools and dividends). Later commercialization stripped the single-tax rules, and casual house rules introduced massive cash injections that break game convergence.
Rent Flow Destination
Land rents are collected by the Public Treasury and distributed as equal social dividends to all players.
Land rents are transferred directly into the private landlord's personal reserve, with cash pot infusions on Free Parking.
Transforms cooperative commonwealth growth into zero-sum wealth polarization and runaway winner dynamics.
Increases Gini coefficient of wealth inequality from 0.12 (Single Tax) to 0.88 (Commercial Monopoly).
Mandatory Property Auctions
If the landing player declines to buy an unowned property at face value, the Banker immediately auctions it to all players.
House rule: Unowned properties simply stay unowned; no auction takes place.
Removes price discovery and asset velocity, forcing players to cycle around the board 4x longer to establish monopolies.
Expected turn length increases from ~60 minutes to 180–300+ minutes.
Free Parking Jackpot Injection
Landing on Free Parking has zero monetary payout (pure resting space).
House rule: All taxes, jail fees, and Community Chest fines pool in the center and are paid to whoever lands on Free Parking.
Infuses random liquidity into bankrupted trailing players without productive development, indefinitely delaying elimination.
Extends Markov extinction time to infinity by subsidizing insolvent agents.
Casual house rules unintentionally destroy Monopoly's design integrity. By adding arbitrary cash infusions (Free Parking) and removing auction velocity, house rules prolong a 45-minute critique of capitalism into a 4-hour endurance test.