Gamblers are betting millions of dollars on measles outbreaks
New York State Department of Health Commissioner James McDonald talking in New York last year about measles outbreaks Jim Franco/Albany Times Union via Getty Images Gamblers are increasingly placing bets on the number of people infected with measles in the US. Since January alone, nearly $9 million dollars have been bet on future cases of the disease on prediction markets Kalshi and Polymarket – and there is some evidence that the predictions are accurate enough to be useful for modelling its spread. Prediction markets involve buying and selling shares related to an outcome. Each market offers a question about future events and the option to bet “yes” or “no”, with the cost of a bet determined by the way others have bet. For example, if 86 per cent of wagers on a given future event are “yes” bets, the cost of a “yes” share is 86 cents. If that event does in fact occur, successful gamblers receive $1 for every share they have bought, with the unsuccessful gamblers – who lose their money – footing …








