Voltaire and the Lottery

Before becoming one of the great figures of the French Enlightenment, Voltaire participates in an astonishing financial operation based on a mathematical flaw in a public lottery. With several associates, he legally exploits a defective calculation system and accumulates a considerable fortune thanks to probabilities.

In the 1720s, the French government seeks to reduce part of its public debt by organizing a lottery linked to state bonds. The system attributes gains proportional to the value of titles held, but contains a fundamental error in its mathematical structure.

The mathematician Charles Marie de La Condamine quickly understands that the total cost of purchasing tickets can be lower than the average statistical value of distributed gains. Voltaire then joins a group of investors exploiting this anomaly.

Participants massively buy fractioned bonds to artificially multiply their chances in the drawings. As the official regulation does not prohibit this strategy, the operation remains perfectly legal despite its manifestly abusive character.

The group wins repeated gains for several months before authorities realize the extent of the problem and modify the system's rules. Voltaire then uses an important part of this fortune to finance his intellectual independence and literary activities. The episode remains today a famous case of probabilistic exploitation in modern financial history, well before contemporary theories of statistical optimization or mathematical arbitrage.